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authorGuillaume Gomez <guillaume1.gomez@gmail.com>2025-05-25 15:11:47 +0200
committerGitHub <noreply@github.com>2025-05-25 15:11:47 +0200
commitd72bc29a33ee695e73cc6d85ba9b20d38067c0ce (patch)
tree30344adbd68a25d3dda090415fd9c736aa232400
parentb0ae2280079c55c526f31255cf69b005fe3ddb92 (diff)
parent4e8b8dad7f29e8fc80265c54aca38b71ecf1af79 (diff)
downloadrust-d72bc29a33ee695e73cc6d85ba9b20d38067c0ce.tar.gz
rust-d72bc29a33ee695e73cc6d85ba9b20d38067c0ce.zip
Rollup merge of #141443 - RalfJung:c-variadic-teach-help, r=workingjubilee
make teach_help message for cast-before-pass-to-variadic more precise

r? `@workingjubilee`
based on your comment [here](https://github.com/rust-lang/rust/issues/44930#issuecomment-2199663198)
-rw-r--r--compiler/rustc_hir_typeck/messages.ftl2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/rustc_hir_typeck/messages.ftl b/compiler/rustc_hir_typeck/messages.ftl
index 23309102c4d..5e79d10612d 100644
--- a/compiler/rustc_hir_typeck/messages.ftl
+++ b/compiler/rustc_hir_typeck/messages.ftl
@@ -169,7 +169,7 @@ hir_typeck_option_result_copied = use `{$def_path}::copied` to copy the value in
 
 hir_typeck_pass_to_variadic_function = can't pass `{$ty}` to variadic function
     .suggestion = cast the value to `{$cast_ty}`
-    .teach_help = certain types, like `{$ty}`, must be casted before passing them to a variadic function, because of arcane ABI rules dictated by the C standard
+    .teach_help = certain types, like `{$ty}`, must be cast before passing them to a variadic function to match the implicit cast that a C compiler would perform as part of C's numeric promotion rules
 
 hir_typeck_ptr_cast_add_auto_to_object = cannot add {$traits_len ->
     [1] auto trait {$traits}