1 files changed, 4 insertions, 3 deletions
diff --git a/compiler/rustc_parse/src/parser/stmt.rs b/compiler/rustc_parse/src/parser/stmt.rs
index 54f9fc5d2b9..9fcf51a04ec 100644
--- a/compiler/rustc_parse/src/parser/stmt.rs
+++ b/compiler/rustc_parse/src/parser/stmt.rs
@@ -23,6 +23,7 @@ use rustc_errors::{Applicability, DiagnosticBuilder, ErrorGuaranteed, PResult};
 use rustc_span::source_map::{BytePos, Span};
 use rustc_span::symbol::{kw, sym, Ident};
 
+use std::borrow::Cow;
 use std::mem;
 use thin_vec::{thin_vec, ThinVec};
 
@@ -364,7 +365,7 @@ impl<'a> Parser<'a> {
                         // `let...else if`. Emit the same error that `parse_block()` would,
                         // but explicitly point out that this pattern is not allowed.
                         let msg = "conditional `else if` is not supported for `let...else`";
-                        return Err(self.error_block_no_opening_brace_msg(msg));
+                        return Err(self.error_block_no_opening_brace_msg(Cow::from(msg)));
                     }
                     let els = self.parse_block()?;
                     self.check_let_else_init_bool_expr(&init);
@@ -438,7 +439,7 @@ impl<'a> Parser<'a> {
 
     fn error_block_no_opening_brace_msg(
         &mut self,
-        msg: &str,
+        msg: Cow<'static, str>,
     ) -> DiagnosticBuilder<'a, ErrorGuaranteed> {
         let sp = self.token.span;
         let mut e = self.struct_span_err(sp, msg);
@@ -502,7 +503,7 @@ impl<'a> Parser<'a> {
     fn error_block_no_opening_brace<T>(&mut self) -> PResult<'a, T> {
         let tok = super::token_descr(&self.token);
         let msg = format!("expected `{{`, found {}", tok);
-        Err(self.error_block_no_opening_brace_msg(&msg))
+        Err(self.error_block_no_opening_brace_msg(Cow::from(msg)))
     }
 
     /// Parses a block. Inner attributes are allowed.