Unescape parser errors

Author: oli-obk

crates/formality-types/src/parse.rs

@@ -43,7 +43,11 @@ where
     let (t, remainder) = match T::parse(&scope, text) {
         Ok(v) => v,
         Err(errors) => {
-            anyhow::bail!("failed to parse {text:?}: {errors:#?}");
+            let mut err = anyhow::anyhow!("failed to parse {text}");
+            for error in errors {
+                err = err.context(error.text.to_owned()).context(error.message);
+            }
+            return Err(err);
         }
     };
     if !skip_whitespace(remainder).is_empty() {

tests/ui/parser.stderr

@@ -1,6 +1,13 @@
-Error: failed to parse "[\n    crate Foo {        \n        trait Baz<> where [ cake ] {}\n    }\n]\n": {
-    ParseError {
-        text: " ] {}\n    }\n]\n",
-        message: "expected `:`",
-    },
-}
+Error: expected `:`
+
+Caused by:
+    0:  ] {}
+           }
+       ]
+       
+    1: failed to parse [
+           crate Foo {        
+               trait Baz<> where [ cake ] {}
+           }
+       ]
+