errors: `set_arg` takes `IntoDiagnosticArg`

Manual implementors of translatable diagnostics will need to call
`set_arg`, not just the derive, so make this function a bit more
ergonomic by taking `IntoDiagnosticArg` rather than
`DiagnosticArgValue`.

Signed-off-by: David Wood <david.wood@huawei.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/compiler/rustc_macros/src/diagnostics/subdiagnostic.rs b/compiler/rustc_macros/src/diagnostics/subdiagnostic.rs
index 65b1328682f..ae5b9dbd9ba 100644
--- a/compiler/rustc_macros/src/diagnostics/subdiagnostic.rs
+++ b/compiler/rustc_macros/src/diagnostics/subdiagnostic.rs
@@ -349,7 +349,7 @@ impl<'a> SessionSubdiagnosticDeriveBuilder<'a> {
         let generated = quote! {
             #diag.set_arg(
                 stringify!(#ident),
-                #binding.into_diagnostic_arg()
+                #binding
             );
         };