chore: multipart_suggestions for manual_assert (rust-lang#13787)

This should address
rust-lang/rust-clippy#13099 for the let_unit
test.

changelog: [manual_assert]: Updated manual_assert to use
multipart_suggestions where appropriate

Author: y21

clippy_lints/src/manual_assert.rs

@@ -1,5 +1,6 @@
 use clippy_utils::diagnostics::span_lint_and_then;
 use clippy_utils::macros::{is_panic, root_macro_call};
+use clippy_utils::source::{indent_of, reindent_multiline};
 use clippy_utils::{higher, is_else_clause, is_parent_stmt, peel_blocks_with_stmt, span_extract_comment, sugg};
 use rustc_errors::Applicability;
 use rustc_hir::{Expr, ExprKind};
@@ -50,32 +51,32 @@ impl<'tcx> LateLintPass<'tcx> for ManualAssert {
             // Should this have a config value?
             && !is_else_clause(cx.tcx, expr)
         {
-            let mut applicability = Applicability::MachineApplicable;
-            let mut comments = span_extract_comment(cx.sess().source_map(), expr.span);
-            if !comments.is_empty() {
-                comments += "\n";
-            }
-            let cond_sugg = !sugg::Sugg::hir_with_context(cx, cond, expr.span.ctxt(), "..", &mut applicability);
-            let semicolon = if is_parent_stmt(cx, expr.hir_id) { ";" } else { "" };
-            let sugg = format!("assert!({cond_sugg}, {format_args_snip}){semicolon}");
-            // we show to the user the suggestion without the comments, but when applying the fix, include the
-            // comments in the block
             span_lint_and_then(
                 cx,
                 MANUAL_ASSERT,
                 expr.span,
                 "only a `panic!` in `if`-then statement",
                 |diag| {
-                    // comments can be noisy, do not show them to the user
+                    let mut applicability = Applicability::MachineApplicable;
+                    let mut comments = span_extract_comment(cx.sess().source_map(), expr.span);
                     if !comments.is_empty() {
-                        diag.tool_only_span_suggestion(
-                            expr.span.shrink_to_lo(),
-                            "add comments back",
-                            comments,
-                            applicability,
-                        );
+                        comments += "\n";
                     }
-                    diag.span_suggestion(expr.span, "try instead", sugg, applicability);
+                    let cond_sugg = !sugg::Sugg::hir_with_context(cx, cond, expr.span.ctxt(), "..", &mut applicability);
+                    let semicolon = if is_parent_stmt(cx, expr.hir_id) { ";" } else { "" };
+
+                    let indent = indent_of(cx, expr.span);
+                    let full_sugg = reindent_multiline(
+                        format!("{comments}assert!({cond_sugg}, {format_args_snip}){semicolon}").as_str(),
+                        true,
+                        indent,
+                    );
+                    diag.span_suggestion_verbose(
+                        expr.span,
+                        "replace `if`-then-`panic!` with `assert!`",
+                        full_sugg,
+                        applicability,
+                    );
                 },
             );
         }

tests/ui/manual_assert.edition2018.fixed

@@ -0,0 +1,98 @@
+//@revisions: edition2018 edition2021
+//@[edition2018] edition:2018
+//@[edition2021] edition:2021
+
+#![warn(clippy::manual_assert)]
+#![allow(dead_code, unused_doc_comments)]
+#![allow(clippy::nonminimal_bool, clippy::uninlined_format_args, clippy::useless_vec)]
+
+macro_rules! one {
+    () => {
+        1
+    };
+}
+
+fn main() {
+    let a = vec![1, 2, 3];
+    let c = Some(2);
+    if !a.is_empty()
+        && a.len() == 3
+        && c.is_some()
+        && !a.is_empty()
+        && a.len() == 3
+        && !a.is_empty()
+        && a.len() == 3
+        && !a.is_empty()
+        && a.len() == 3
+    {
+        panic!("qaqaq{:?}", a);
+    }
+    //~^ manual_assert
+    assert!(a.is_empty(), "qaqaq{:?}", a);
+    //~^ manual_assert
+    assert!(a.is_empty(), "qwqwq");
+    if a.len() == 3 {
+        println!("qwq");
+        println!("qwq");
+        println!("qwq");
+    }
+    if let Some(b) = c {
+        panic!("orz {}", b);
+    }
+    if a.len() == 3 {
+        panic!("qaqaq");
+    } else {
+        println!("qwq");
+    }
+    let b = vec![1, 2, 3];
+    //~^ manual_assert
+    assert!(!b.is_empty(), "panic1");
+    //~^ manual_assert
+    assert!(!(b.is_empty() && a.is_empty()), "panic2");
+    //~^ manual_assert
+    assert!(!(a.is_empty() && !b.is_empty()), "panic3");
+    //~^ manual_assert
+    assert!(!(b.is_empty() || a.is_empty()), "panic4");
+    //~^ manual_assert
+    assert!(!(a.is_empty() || !b.is_empty()), "panic5");
+    //~^ manual_assert
+    assert!(!a.is_empty(), "with expansion {}", one!());
+    if a.is_empty() {
+        let _ = 0;
+    } else if a.len() == 1 {
+        panic!("panic6");
+    }
+}
+
+fn issue7730(a: u8) {
+    // Suggestion should preserve comment
+    //~^ manual_assert
+    // comment
+    /* this is a
+            multiline
+            comment */
+    /// Doc comment
+    // comment after `panic!`
+    assert!(a <= 2, "panic with comment");
+}
+
+fn issue12505() {
+    struct Foo<T, const N: usize>(T);
+
+    impl<T, const N: usize> Foo<T, N> {
+        const BAR: () = //~^ manual_assert
+        assert!(N != 0, );
+    }
+}
+
+fn issue15227(left: u64, right: u64) -> u64 {
+    macro_rules! is_x86_feature_detected {
+        ($feature:literal) => {
+            $feature.len() > 0 && $feature.starts_with("ss")
+        };
+    }
+
+    //~^ manual_assert
+    assert!(is_x86_feature_detected!("ssse3"), "SSSE3 is not supported");
+    unsafe { todo!() }
+}