Rollup merge of #121288 - tshepang:make-expand-translatable, r=michaelwoerister

make rustc_expand translatable

these are the last of the easy ones

compiler/rustc_expand/src/errors.rs

@@ -392,6 +392,36 @@ pub(crate) struct ProcMacroPanickedHelp {
     pub message: String,
 }
 
+#[derive(Diagnostic)]
+#[diag(expand_proc_macro_derive_panicked)]
+pub(crate) struct ProcMacroDerivePanicked {
+    #[primary_span]
+    pub span: Span,
+    #[subdiagnostic]
+    pub message: Option<ProcMacroDerivePanickedHelp>,
+}
+
+#[derive(Subdiagnostic)]
+#[help(expand_help)]
+pub(crate) struct ProcMacroDerivePanickedHelp {
+    pub message: String,
+}
+
+#[derive(Diagnostic)]
+#[diag(expand_custom_attribute_panicked)]
+pub(crate) struct CustomAttributePanicked {
+    #[primary_span]
+    pub span: Span,
+    #[subdiagnostic]
+    pub message: Option<CustomAttributePanickedHelp>,
+}
+
+#[derive(Subdiagnostic)]
+#[help(expand_help)]
+pub(crate) struct CustomAttributePanickedHelp {
+    pub message: String,
+}
+
 #[derive(Diagnostic)]
 #[diag(expand_proc_macro_derive_tokens)]
 pub struct ProcMacroDeriveTokens {

compiler/rustc_expand/src/proc_macro.rs

@@ -93,11 +93,12 @@ impl base::AttrProcMacro for AttrProcMacro {
         let server = proc_macro_server::Rustc::new(ecx);
         self.client.run(&strategy, server, annotation, annotated, proc_macro_backtrace).map_err(
             |e| {
-                let mut err = ecx.dcx().struct_span_err(span, "custom attribute panicked");
-                if let Some(s) = e.as_str() {
-                    err.help(format!("message: {s}"));
-                }
-                err.emit()
+                ecx.dcx().emit_err(errors::CustomAttributePanicked {
+                    span,
+                    message: e.as_str().map(|message| errors::CustomAttributePanickedHelp {
+                        message: message.into(),
+                    }),
+                })
             },
         )
     }
@@ -146,11 +147,14 @@ impl MultiItemModifier for DeriveProcMacro {
             match self.client.run(&strategy, server, input, proc_macro_backtrace) {
                 Ok(stream) => stream,
                 Err(e) => {
-                    let mut err = ecx.dcx().struct_span_err(span, "proc-macro derive panicked");
-                    if let Some(s) = e.as_str() {
-                        err.help(format!("message: {s}"));
-                    }
-                    err.emit();
+                    ecx.dcx().emit_err({
+                        errors::ProcMacroDerivePanicked {
+                            span,
+                            message: e.as_str().map(|message| {
+                                errors::ProcMacroDerivePanickedHelp { message: message.into() }
+                            }),
+                        }
+                    });
                     return ExpandResult::Ready(vec![]);
                 }
             }