diff --git a/src/mutant.rs b/src/mutant.rs
index 2f6eab2d..e847f14e 100644
--- a/src/mutant.rs
+++ b/src/mutant.rs
@@ -49,6 +49,12 @@ pub enum MutationTarget {
 /// A mutation applied to source code.
 #[derive(Clone, Eq, PartialEq, Debug)]
 pub struct Mutant {
+    /// A precomputed human-readable name for this mutant, including the file,
+    /// location, and change description.
+    ///
+    /// This is used in CLI output, filtering, and JSON.
+    pub name: String,
+
     /// Which file is being mutated.
     pub source_file: SourceFile,
 
@@ -103,6 +109,34 @@ pub struct Function {
 }
 
 impl Mutant {
+    /// Construct a mutant discovered while walking source code.
+    ///
+    /// This initializes all fields and precomputes the human-readable `name`
+    /// (including file path, line/column, and change description) for use in
+    /// CLI output, filtering, and JSON.
+    pub(crate) fn new_discovered(
+        source_file: SourceFile,
+        function: Option<Arc<Function>>,
+        span: Span,
+        short_replaced: Option<String>,
+        replacement: String,
+        genre: Genre,
+        target: Option<MutationTarget>,
+    ) -> Self {
+        let mut mutant = Mutant {
+            name: String::new(),
+            source_file,
+            function,
+            span,
+            short_replaced,
+            replacement,
+            genre,
+            target,
+        };
+        mutant.name = mutant.name(true);
+        mutant
+    }
+
     /// Return text of the whole file with the mutation applied.
     pub fn mutated_code(&self) -> String {
         self.span.replace(
@@ -293,6 +327,7 @@ impl Serialize for Mutant {
     {
         // custom serialize to omit inessential info
         let mut ss = serializer.serialize_struct("Mutant", 7)?;
+        ss.serialize_field("name", &self.name)?;
         ss.serialize_field("package", &self.source_file.package.name)?;
         ss.serialize_field("file", &self.source_file.tree_relative_slashes())?;
         ss.serialize_field("function", &self.function.as_ref().map(Arc::as_ref))?;
diff --git a/src/visit.rs b/src/visit.rs
index 7ddc73d4..cbebf23a 100644
--- a/src/visit.rs
+++ b/src/visit.rs
@@ -44,10 +44,9 @@ pub struct Discovered {
 impl Discovered {
     pub(crate) fn remove_previously_caught(&mut self, previously_caught: &[String]) {
         self.mutants.retain(|m| {
-            let name = m.name(true);
-            let c = previously_caught.contains(&name);
+            let c = previously_caught.contains(&m.name);
             if c {
-                trace!(?name, "skip previously caught mutant");
+                trace!(name = %m.name, "skip previously caught mutant");
             }
             !c
         });
@@ -75,6 +74,7 @@ pub fn walk_tree(
         mutants.append(&mut package_mutants);
         files.append(&mut package_files);
     }
+
     progress.finish();
     Ok(Discovered { mutants, files })
 }
@@ -318,15 +318,16 @@ impl DiscoveryVisitor<'_> {
 
     /// Record that we generated some mutants.
     fn collect_mutant(&mut self, span: Span, replacement: &TokenStream, genre: Genre) {
-        self.mutants.push(Mutant {
-            source_file: self.source_file.clone(),
-            function: self.fn_stack.last().cloned(),
+        let mutant = Mutant::new_discovered(
+            self.source_file.clone(),
+            self.fn_stack.last().cloned(),
             span,
-            short_replaced: None,
-            replacement: replacement.to_pretty_string(),
+            None,
+            replacement.to_pretty_string(),
             genre,
-            target: None,
-        });
+            None,
+        );
+        self.mutants.push(mutant);
     }
 
     fn collect_fn_mutants(&mut self, sig: &Signature, block: &Block) {
@@ -656,15 +657,15 @@ impl<'ast> Visit<'ast> for DiscoveryVisitor<'_> {
                     continue;
                 }
                 let short_replaced = Some(arm.pat.to_pretty_string());
-                let mutant = Mutant {
-                    source_file: self.source_file.clone(),
-                    function: self.fn_stack.last().cloned(),
-                    span: arm.span().into(),
+                let mutant = Mutant::new_discovered(
+                    self.source_file.clone(),
+                    self.fn_stack.last().cloned(),
+                    arm.span().into(),
                     short_replaced,
-                    replacement: String::new(),
-                    genre: Genre::MatchArm,
-                    target: None,
-                };
+                    String::new(),
+                    Genre::MatchArm,
+                    None,
+                );
                 self.mutants.push(mutant);
             }
         } else {
@@ -722,18 +723,18 @@ impl<'ast> Visit<'ast> for DiscoveryVisitor<'_> {
                         // No comma, just the field
                         field.span().into()
                     };
-                    let mutant = Mutant {
-                        source_file: self.source_file.clone(),
-                        function: self.fn_stack.last().cloned(),
+                    let mutant = Mutant::new_discovered(
+                        self.source_file.clone(),
+                        self.fn_stack.last().cloned(),
                         span,
-                        short_replaced: None,
-                        replacement: String::new(),
-                        genre: Genre::StructField,
-                        target: Some(MutationTarget::StructLiteralField {
+                        None,
+                        String::new(),
+                        Genre::StructField,
+                        Some(MutationTarget::StructLiteralField {
                             field_name: field_name_str,
                             struct_name: struct_name.clone(),
                         }),
-                    };
+                    );
                     self.mutants.push(mutant);
                 }
             }
diff --git a/tests/snapshots/main__mutants.json.snap b/tests/snapshots/main__mutants.json.snap
index 2ed16e42..f941aa5b 100644
--- a/tests/snapshots/main__mutants.json.snap
+++ b/tests/snapshots/main__mutants.json.snap
@@ -4,6 +4,7 @@ expression: mutants_json
 ---
 [
   {
+    "name": "src/bin/factorial.rs:2:5: replace main with ()",
     "package": "cargo-mutants-testdata-factorial",
     "file": "src/bin/factorial.rs",
     "function": {
@@ -34,6 +35,7 @@ expression: mutants_json
     "genre": "FnValue"
   },
   {
+    "name": "src/bin/factorial.rs:8:5: replace factorial -> u32 with 0",
     "package": "cargo-mutants-testdata-factorial",
     "file": "src/bin/factorial.rs",
     "function": {
@@ -64,6 +66,7 @@ expression: mutants_json
     "genre": "FnValue"
   },
   {
+    "name": "src/bin/factorial.rs:8:5: replace factorial -> u32 with 1",
     "package": "cargo-mutants-testdata-factorial",
     "file": "src/bin/factorial.rs",
     "function": {
@@ -94,6 +97,7 @@ expression: mutants_json
     "genre": "FnValue"
   },
   {
+    "name": "src/bin/factorial.rs:10:11: replace *= with += in factorial",
     "package": "cargo-mutants-testdata-factorial",
     "file": "src/bin/factorial.rs",
     "function": {
@@ -124,6 +128,7 @@ expression: mutants_json
     "genre": "BinaryOperator"
   },
   {
+    "name": "src/bin/factorial.rs:10:11: replace *= with /= in factorial",
     "package": "cargo-mutants-testdata-factorial",
     "file": "src/bin/factorial.rs",
     "function": {
diff --git a/tests/util/snapshots/main__util__list_mutants_in_cfg_attr_test_skip_json.snap b/tests/util/snapshots/main__util__list_mutants_in_cfg_attr_test_skip_json.snap
index 333e80fe..104bc738 100644
--- a/tests/util/snapshots/main__util__list_mutants_in_cfg_attr_test_skip_json.snap
+++ b/tests/util/snapshots/main__util__list_mutants_in_cfg_attr_test_skip_json.snap
@@ -20,6 +20,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/lib.rs:18:5: replace double -> usize with 0",
     "package": "cargo-mutants-testdata-cfg-attr-test-skip",
     "replacement": "0",
     "span": {
@@ -50,6 +51,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/lib.rs:18:5: replace double -> usize with 1",
     "package": "cargo-mutants-testdata-cfg-attr-test-skip",
     "replacement": "1",
     "span": {
@@ -80,6 +82,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "BinaryOperator",
+    "name": "src/lib.rs:18:7: replace * with + in double",
     "package": "cargo-mutants-testdata-cfg-attr-test-skip",
     "replacement": "+",
     "span": {
@@ -110,6 +113,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "BinaryOperator",
+    "name": "src/lib.rs:18:7: replace * with / in double",
     "package": "cargo-mutants-testdata-cfg-attr-test-skip",
     "replacement": "/",
     "span": {
diff --git a/tests/util/snapshots/main__util__list_mutants_in_factorial_json.snap b/tests/util/snapshots/main__util__list_mutants_in_factorial_json.snap
index a8ce6774..c199947b 100644
--- a/tests/util/snapshots/main__util__list_mutants_in_factorial_json.snap
+++ b/tests/util/snapshots/main__util__list_mutants_in_factorial_json.snap
@@ -20,6 +20,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/bin/factorial.rs:2:5: replace main with ()",
     "package": "cargo-mutants-testdata-factorial",
     "replacement": "()",
     "span": {
@@ -50,6 +51,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/bin/factorial.rs:8:5: replace factorial -> u32 with 0",
     "package": "cargo-mutants-testdata-factorial",
     "replacement": "0",
     "span": {
@@ -80,6 +82,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/bin/factorial.rs:8:5: replace factorial -> u32 with 1",
     "package": "cargo-mutants-testdata-factorial",
     "replacement": "1",
     "span": {
@@ -110,6 +113,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "BinaryOperator",
+    "name": "src/bin/factorial.rs:10:11: replace *= with += in factorial",
     "package": "cargo-mutants-testdata-factorial",
     "replacement": "+=",
     "span": {
@@ -140,6 +144,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "BinaryOperator",
+    "name": "src/bin/factorial.rs:10:11: replace *= with /= in factorial",
     "package": "cargo-mutants-testdata-factorial",
     "replacement": "/=",
     "span": {
diff --git a/tests/util/snapshots/main__util__list_mutants_json_well_tested.snap b/tests/util/snapshots/main__util__list_mutants_json_well_tested.snap
index 0ad2ad45..a1a4b3f0 100644
--- a/tests/util/snapshots/main__util__list_mutants_json_well_tested.snap
+++ b/tests/util/snapshots/main__util__list_mutants_json_well_tested.snap
@@ -20,6 +20,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/arc.rs:4:5: replace return_arc -> Arc<String> with Arc::new(String::new())",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "Arc::new(String::new())",
     "span": {
@@ -50,6 +51,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/arc.rs:4:5: replace return_arc -> Arc<String> with Arc::new(\"xyzzy\".into())",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "Arc::new(\"xyzzy\".into())",
     "span": {
@@ -80,6 +82,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/booleans.rs:2:5: replace and -> bool with true",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "true",
     "span": {
@@ -110,6 +113,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/booleans.rs:2:5: replace and -> bool with false",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "false",
     "span": {
@@ -140,6 +144,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "BinaryOperator",
+    "name": "src/booleans.rs:2:7: replace && with || in and",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "||",
     "span": {
@@ -170,6 +175,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/booleans.rs:6:5: replace or -> bool with true",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "true",
     "span": {
@@ -200,6 +206,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/booleans.rs:6:5: replace or -> bool with false",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "false",
     "span": {
@@ -230,6 +237,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "BinaryOperator",
+    "name": "src/booleans.rs:6:7: replace || with && in or",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "&&",
     "span": {
@@ -260,6 +268,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/booleans.rs:10:5: replace xor -> bool with true",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "true",
     "span": {
@@ -290,6 +299,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/booleans.rs:10:5: replace xor -> bool with false",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "false",
     "span": {
@@ -320,6 +330,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "BinaryOperator",
+    "name": "src/booleans.rs:10:7: replace ^ with | in xor",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "|",
     "span": {
@@ -350,6 +361,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "BinaryOperator",
+    "name": "src/booleans.rs:10:7: replace ^ with & in xor",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "&",
     "span": {
@@ -380,6 +392,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/booleans.rs:14:5: replace not -> bool with true",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "true",
     "span": {
@@ -410,6 +423,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/booleans.rs:14:5: replace not -> bool with false",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "false",
     "span": {
@@ -440,6 +454,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "UnaryOperator",
+    "name": "src/booleans.rs:14:5: delete ! in not",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "",
     "span": {
@@ -470,6 +485,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/inside_mod.rs:4:13: replace outer::inner::name -> &'static str with \"\"",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "\"\"",
     "span": {
@@ -500,6 +516,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/inside_mod.rs:4:13: replace outer::inner::name -> &'static str with \"xyzzy\"",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "\"xyzzy\"",
     "span": {
@@ -530,6 +547,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/methods.rs:17:9: replace Foo::double with ()",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "()",
     "span": {
@@ -560,6 +578,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "BinaryOperator",
+    "name": "src/methods.rs:17:16: replace *= with += in Foo::double",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "+=",
     "span": {
@@ -590,6 +609,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "BinaryOperator",
+    "name": "src/methods.rs:17:16: replace *= with /= in Foo::double",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "/=",
     "span": {
@@ -620,6 +640,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/methods.rs:23:9: replace <impl fmt::Display for Foo>::fmt -> fmt::Result with Ok(Default::default())",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "Ok(Default::default())",
     "span": {
@@ -650,6 +671,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/methods.rs:29:9: replace <impl fmt::Debug for &Foo>::fmt -> fmt::Result with Ok(Default::default())",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "Ok(Default::default())",
     "span": {
@@ -680,6 +702,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/nested_function.rs:2:5: replace has_nested -> u32 with 0",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "0",
     "span": {
@@ -710,6 +733,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/nested_function.rs:2:5: replace has_nested -> u32 with 1",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "1",
     "span": {
@@ -740,6 +764,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/nested_function.rs:3:9: replace has_nested::inner -> u32 with 0",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "0",
     "span": {
@@ -770,6 +795,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/nested_function.rs:3:9: replace has_nested::inner -> u32 with 1",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "1",
     "span": {
@@ -800,6 +826,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "BinaryOperator",
+    "name": "src/nested_function.rs:5:13: replace * with + in has_nested",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "+",
     "span": {
@@ -830,6 +857,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "BinaryOperator",
+    "name": "src/nested_function.rs:5:13: replace * with / in has_nested",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "/",
     "span": {
@@ -860,6 +888,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/numbers.rs:2:5: replace double_float -> f32 with 0.0",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "0.0",
     "span": {
@@ -890,6 +919,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/numbers.rs:2:5: replace double_float -> f32 with 1.0",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "1.0",
     "span": {
@@ -920,6 +950,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/numbers.rs:2:5: replace double_float -> f32 with -1.0",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "-1.0",
     "span": {
@@ -950,6 +981,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "BinaryOperator",
+    "name": "src/numbers.rs:2:9: replace * with + in double_float",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "+",
     "span": {
@@ -980,6 +1012,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "BinaryOperator",
+    "name": "src/numbers.rs:2:9: replace * with / in double_float",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "/",
     "span": {
@@ -1010,6 +1043,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/numbers.rs:6:5: replace is_double -> bool with true",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "true",
     "span": {
@@ -1040,6 +1074,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/numbers.rs:6:5: replace is_double -> bool with false",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "false",
     "span": {
@@ -1070,6 +1105,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "BinaryOperator",
+    "name": "src/numbers.rs:6:7: replace == with != in is_double",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "!=",
     "span": {
@@ -1100,6 +1136,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "BinaryOperator",
+    "name": "src/numbers.rs:6:12: replace * with + in is_double",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "+",
     "span": {
@@ -1130,6 +1167,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "BinaryOperator",
+    "name": "src/numbers.rs:6:12: replace * with / in is_double",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "/",
     "span": {
@@ -1160,6 +1198,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/numbers.rs:10:5: replace negate_i32 -> i32 with 0",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "0",
     "span": {
@@ -1190,6 +1229,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/numbers.rs:10:5: replace negate_i32 -> i32 with 1",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "1",
     "span": {
@@ -1220,6 +1260,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/numbers.rs:10:5: replace negate_i32 -> i32 with -1",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "-1",
     "span": {
@@ -1250,6 +1291,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "UnaryOperator",
+    "name": "src/numbers.rs:10:5: delete - in negate_i32",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "",
     "span": {
@@ -1280,6 +1322,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/numbers.rs:14:5: replace negate_f32 -> f32 with 0.0",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "0.0",
     "span": {
@@ -1310,6 +1353,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/numbers.rs:14:5: replace negate_f32 -> f32 with 1.0",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "1.0",
     "span": {
@@ -1340,6 +1384,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/numbers.rs:14:5: replace negate_f32 -> f32 with -1.0",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "-1.0",
     "span": {
@@ -1370,6 +1415,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "UnaryOperator",
+    "name": "src/numbers.rs:14:5: delete - in negate_f32",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "",
     "span": {
@@ -1400,6 +1446,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/numbers.rs:18:5: replace bitwise_not_i32 -> i32 with 0",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "0",
     "span": {
@@ -1430,6 +1477,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/numbers.rs:18:5: replace bitwise_not_i32 -> i32 with 1",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "1",
     "span": {
@@ -1460,6 +1508,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/numbers.rs:18:5: replace bitwise_not_i32 -> i32 with -1",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "-1",
     "span": {
@@ -1490,6 +1539,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "UnaryOperator",
+    "name": "src/numbers.rs:18:5: delete ! in bitwise_not_i32",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "",
     "span": {
@@ -1520,6 +1570,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/numbers.rs:22:5: replace bitwise_not_u32 -> u32 with 0",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "0",
     "span": {
@@ -1550,6 +1601,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/numbers.rs:22:5: replace bitwise_not_u32 -> u32 with 1",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "1",
     "span": {
@@ -1580,6 +1632,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "UnaryOperator",
+    "name": "src/numbers.rs:22:5: delete ! in bitwise_not_u32",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "",
     "span": {
@@ -1610,6 +1663,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/result.rs:6:5: replace simple_result -> Result<&'static str, ()> with Ok(\"\")",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "Ok(\"\")",
     "span": {
@@ -1640,6 +1694,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/result.rs:6:5: replace simple_result -> Result<&'static str, ()> with Ok(\"xyzzy\")",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "Ok(\"xyzzy\")",
     "span": {
@@ -1670,6 +1725,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/result.rs:10:5: replace error_if_negative -> Result<(), ()> with Ok(())",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "Ok(())",
     "span": {
@@ -1700,6 +1756,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "BinaryOperator",
+    "name": "src/result.rs:10:10: replace < with == in error_if_negative",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "==",
     "span": {
@@ -1730,6 +1787,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "BinaryOperator",
+    "name": "src/result.rs:10:10: replace < with > in error_if_negative",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": ">",
     "span": {
@@ -1760,6 +1818,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "BinaryOperator",
+    "name": "src/result.rs:10:10: replace < with <= in error_if_negative",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "<=",
     "span": {
@@ -1790,6 +1849,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/result.rs:18:5: replace result_with_no_apparent_type_args -> std::fmt::Result with Ok(Default::default())",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "Ok(Default::default())",
     "span": {
@@ -1820,6 +1880,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/sets.rs:4:5: replace make_a_set -> BTreeSet<String> with BTreeSet::new()",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "BTreeSet::new()",
     "span": {
@@ -1850,6 +1911,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/sets.rs:4:5: replace make_a_set -> BTreeSet<String> with BTreeSet::from_iter([String::new()])",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "BTreeSet::from_iter([String::new()])",
     "span": {
@@ -1880,6 +1942,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/sets.rs:4:5: replace make_a_set -> BTreeSet<String> with BTreeSet::from_iter([\"xyzzy\".into()])",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "BTreeSet::from_iter([\"xyzzy\".into()])",
     "span": {
@@ -1910,6 +1973,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/simple_fns.rs:8:5: replace returns_unit with ()",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "()",
     "span": {
@@ -1940,6 +2004,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "BinaryOperator",
+    "name": "src/simple_fns.rs:8:8: replace += with -= in returns_unit",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "-=",
     "span": {
@@ -1970,6 +2035,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "BinaryOperator",
+    "name": "src/simple_fns.rs:8:8: replace += with *= in returns_unit",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "*=",
     "span": {
@@ -2000,6 +2066,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/simple_fns.rs:13:5: replace returns_42u32 -> u32 with 0",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "0",
     "span": {
@@ -2030,6 +2097,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/simple_fns.rs:13:5: replace returns_42u32 -> u32 with 1",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "1",
     "span": {
@@ -2060,6 +2128,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/simple_fns.rs:18:5: replace divisible_by_three -> bool with true",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "true",
     "span": {
@@ -2090,6 +2159,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/simple_fns.rs:18:5: replace divisible_by_three -> bool with false",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "false",
     "span": {
@@ -2120,6 +2190,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "BinaryOperator",
+    "name": "src/simple_fns.rs:18:11: replace == with != in divisible_by_three",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "!=",
     "span": {
@@ -2150,6 +2221,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "BinaryOperator",
+    "name": "src/simple_fns.rs:18:7: replace % with / in divisible_by_three",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "/",
     "span": {
@@ -2180,6 +2252,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "BinaryOperator",
+    "name": "src/simple_fns.rs:18:7: replace % with + in divisible_by_three",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "+",
     "span": {
@@ -2210,6 +2283,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/simple_fns.rs:27:5: replace double_string -> String with String::new()",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "String::new()",
     "span": {
@@ -2240,6 +2314,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/simple_fns.rs:27:5: replace double_string -> String with \"xyzzy\".into()",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "\"xyzzy\".into()",
     "span": {
@@ -2270,6 +2345,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/slices.rs:4:5: replace pad -> &'a[Cow<'static, str>] with Vec::leak(Vec::new())",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "Vec::leak(Vec::new())",
     "span": {
@@ -2300,6 +2376,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/slices.rs:4:5: replace pad -> &'a[Cow<'static, str>] with Vec::leak(vec![Cow::Borrowed(\"\")])",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "Vec::leak(vec![Cow::Borrowed(\"\")])",
     "span": {
@@ -2330,6 +2407,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/slices.rs:4:5: replace pad -> &'a[Cow<'static, str>] with Vec::leak(vec![Cow::Owned(\"\".to_owned())])",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "Vec::leak(vec![Cow::Owned(\"\".to_owned())])",
     "span": {
@@ -2360,6 +2438,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/slices.rs:4:5: replace pad -> &'a[Cow<'static, str>] with Vec::leak(vec![Cow::Borrowed(\"xyzzy\")])",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "Vec::leak(vec![Cow::Borrowed(\"xyzzy\")])",
     "span": {
@@ -2390,6 +2469,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/slices.rs:4:5: replace pad -> &'a[Cow<'static, str>] with Vec::leak(vec![Cow::Owned(\"xyzzy\".to_owned())])",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "Vec::leak(vec![Cow::Owned(\"xyzzy\".to_owned())])",
     "span": {
@@ -2420,6 +2500,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "BinaryOperator",
+    "name": "src/slices.rs:5:20: replace < with == in pad",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "==",
     "span": {
@@ -2450,6 +2531,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "BinaryOperator",
+    "name": "src/slices.rs:5:20: replace < with > in pad",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": ">",
     "span": {
@@ -2480,6 +2562,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "BinaryOperator",
+    "name": "src/slices.rs:5:20: replace < with <= in pad",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "<=",
     "span": {
@@ -2510,6 +2593,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/slices.rs:13:5: replace return_mut_slice -> &mut[usize] with Vec::leak(Vec::new())",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "Vec::leak(Vec::new())",
     "span": {
@@ -2540,6 +2624,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/slices.rs:13:5: replace return_mut_slice -> &mut[usize] with Vec::leak(vec![0])",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "Vec::leak(vec![0])",
     "span": {
@@ -2570,6 +2655,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/slices.rs:13:5: replace return_mut_slice -> &mut[usize] with Vec::leak(vec![1])",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "Vec::leak(vec![1])",
     "span": {
@@ -2600,6 +2686,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "BinaryOperator",
+    "name": "src/slices.rs:14:12: replace *= with += in return_mut_slice",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "+=",
     "span": {
@@ -2630,6 +2717,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "BinaryOperator",
+    "name": "src/slices.rs:14:12: replace *= with /= in return_mut_slice",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "/=",
     "span": {
@@ -2647,6 +2735,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
     "file": "src/static_item.rs",
     "function": null,
     "genre": "BinaryOperator",
+    "name": "src/static_item.rs:1:33: replace == with !=",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "!=",
     "span": {
@@ -2664,6 +2753,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
     "file": "src/static_item.rs",
     "function": null,
     "genre": "BinaryOperator",
+    "name": "src/static_item.rs:1:39: replace + with -",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "-",
     "span": {
@@ -2681,6 +2771,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
     "file": "src/static_item.rs",
     "function": null,
     "genre": "BinaryOperator",
+    "name": "src/static_item.rs:1:39: replace + with *",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "*",
     "span": {
@@ -2711,6 +2802,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/struct_with_lifetime.rs:15:9: replace Lex<'buf>::buf_len -> usize with 0",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "0",
     "span": {
@@ -2741,6 +2833,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/struct_with_lifetime.rs:15:9: replace Lex<'buf>::buf_len -> usize with 1",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "1",
     "span": {
@@ -2771,6 +2864,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/traits.rs:5:9: replace Something::is_three -> bool with true",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "true",
     "span": {
@@ -2801,6 +2895,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/traits.rs:5:9: replace Something::is_three -> bool with false",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "false",
     "span": {
@@ -2831,6 +2926,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "BinaryOperator",
+    "name": "src/traits.rs:5:11: replace == with != in Something::is_three",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "!=",
     "span": {
diff --git a/tests/util/snapshots/main__util__list_mutants_regex_filters_json.snap b/tests/util/snapshots/main__util__list_mutants_regex_filters_json.snap
index f011e129..3a412e56 100644
--- a/tests/util/snapshots/main__util__list_mutants_regex_filters_json.snap
+++ b/tests/util/snapshots/main__util__list_mutants_regex_filters_json.snap
@@ -20,6 +20,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "FnValue",
+    "name": "src/simple_fns.rs:18:5: replace divisible_by_three -> bool with true",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "true",
     "span": {
@@ -50,6 +51,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "BinaryOperator",
+    "name": "src/simple_fns.rs:18:11: replace == with != in divisible_by_three",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "!=",
     "span": {
@@ -80,6 +82,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "BinaryOperator",
+    "name": "src/simple_fns.rs:18:7: replace % with / in divisible_by_three",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "/",
     "span": {
@@ -110,6 +113,7 @@ expression: "String::from_utf8_lossy(&output.stdout)"
       }
     },
     "genre": "BinaryOperator",
+    "name": "src/simple_fns.rs:18:7: replace % with + in divisible_by_three",
     "package": "cargo-mutants-testdata-well-tested",
     "replacement": "+",
     "span": {