Don't suggest turning non-char-literal exprs of ty `char` into string literals

1 files changed, 9 insertions, 4 deletions

diff --git a/compiler/rustc_infer/src/infer/error_reporting/mod.rs b/compiler/rustc_infer/src/infer/error_reporting/mod.rs
index e0894ed31bf..c7affaa17e9 100644
--- a/compiler/rustc_infer/src/infer/error_reporting/mod.rs
+++ b/compiler/rustc_infer/src/infer/error_reporting/mod.rs
@@ -2064,10 +2064,15 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
                 // If a string was expected and the found expression is a character literal,
                 // perhaps the user meant to write `"s"` to specify a string literal.
                 (ty::Ref(_, r, _), ty::Char) if r.is_str() => {
-                    suggestions.push(TypeErrorAdditionalDiags::MeantStrLiteral {
-                        start: span.with_hi(span.lo() + BytePos(1)),
-                        end: span.with_lo(span.hi() - BytePos(1)),
-                    })
+                    if let Ok(code) = self.tcx.sess().source_map().span_to_snippet(span)
+                        && code.starts_with("'")
+                        && code.ends_with("'")
+                    {
+                        suggestions.push(TypeErrorAdditionalDiags::MeantStrLiteral {
+                            start: span.with_hi(span.lo() + BytePos(1)),
+                            end: span.with_lo(span.hi() - BytePos(1)),
+                        });
+                    }
                 }
                 // For code `if Some(..) = expr `, the type mismatch may be expected `bool` but found `()`,
                 // we try to suggest to add the missing `let` for `if let Some(..) = expr`