Always format to internal String in FmtPrinter

[rust.git] / compiler / rustc_infer / src / infer / error_reporting / mod.rs

diff --git a/compiler/rustc_infer/src/infer/error_reporting/mod.rs b/compiler/rustc_infer/src/infer/error_reporting/mod.rs
index d900379c44c629a9c29ee6d919c9c0db1dbce46c..86583d29ec0c266bb3e32b7a8231521016a02e6a 100644 (file)
--- a/compiler/rustc_infer/src/infer/error_reporting/mod.rs
+++ b/compiler/rustc_infer/src/infer/error_reporting/mod.rs
@@ -988,8 +988,7 @@ fn cmp_fn_sig(
     ) -> (DiagnosticStyledString, DiagnosticStyledString) {
         let get_lifetimes = |sig| {
             use rustc_hir::def::Namespace;
-            let mut s = String::new();
-            let (_, sig, reg) = ty::print::FmtPrinter::new(self.tcx, &mut s, Namespace::TypeNS)
+            let (_, sig, reg) = ty::print::FmtPrinter::new(self.tcx, Namespace::TypeNS)
                 .name_all_regions(sig)
                 .unwrap();
             let lts: Vec<String> = reg.into_iter().map(|(_, kind)| kind.to_string()).collect();