adding extra error message

Author: ZuseZ4

compiler/rustc_ast/src/expand/mod.rs

@@ -5,6 +5,8 @@ use rustc_span::{def_id::DefId, symbol::Ident};
 use crate::MetaItem;
 
 pub mod allocator;
+pub mod typetree;
+pub mod autodiff_attrs;
 
 #[derive(Debug, Clone, Encodable, Decodable, HashStable_Generic)]
 pub struct StrippedCfgItem<ModId = DefId> {

compiler/rustc_codegen_llvm/messages.ftl

@@ -60,6 +60,9 @@ codegen_llvm_prepare_thin_lto_module_with_llvm_err = failed to prepare thin LTO
 codegen_llvm_run_passes = failed to run LLVM passes
 codegen_llvm_run_passes_with_llvm_err = failed to run LLVM passes: {$llvm_err}
 
+codegen_llvm_prepare_autodiff = failed to prepare AutoDiff: src: {$src}, target: {$target}, {$error}
+codegen_llvm_prepare_autodiff_with_llvm_err = failed to prepare AutoDiff: {$llvm_err}, src: {$src}, target: {$target}, {$error}
+
 codegen_llvm_sanitizer_memtag_requires_mte =
     `-Zsanitizer=memtag` requires `-Ctarget-feature=+mte`
 

compiler/rustc_codegen_llvm/src/errors.rs

@@ -182,6 +182,12 @@ pub enum LlvmError<'a> {
     PrepareThinLtoModule,
     #[diag(codegen_llvm_parse_bitcode)]
     ParseBitcode,
+    #[diag(codegen_llvm_prepare_autodiff)]
+    PrepareAutoDiff {
+                src: String,
+                target: String,
+                error: String,
+    },
 }
 
 pub(crate) struct WithLlvmError<'a>(pub LlvmError<'a>, pub String);
@@ -203,6 +209,9 @@ impl<G: EmissionGuarantee> IntoDiagnostic<'_, G> for WithLlvmError<'_> {
             }
             PrepareThinLtoModule => fluent::codegen_llvm_prepare_thin_lto_module_with_llvm_err,
             ParseBitcode => fluent::codegen_llvm_parse_bitcode_with_llvm_err,
+            PrepareAutoDiff { .. } => {
+                fluent::codegen_llvm_prepare_autodiff_with_llvm_err
+            }
         };
         let mut diag = self.0.into_diagnostic(dcx, level);
         diag.set_primary_message(msg_with_llvm_err);