pr review changes

Author: KMJ-007

compiler/rustc_ast/src/expand/autodiff_attrs.rs

@@ -86,7 +86,6 @@ pub struct AutoDiffItem {
     /// The name of the function being generated
     pub target: String,
     pub attrs: AutoDiffAttrs,
-    // Type Tree support
     pub inputs: Vec<TypeTree>,
     pub output: TypeTree,
 }

compiler/rustc_codegen_gcc/src/builder.rs

@@ -1384,6 +1384,7 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
         _src_align: Align,
         size: RValue<'gcc>,
         flags: MemFlags,
+        // `tt` is an LLVM-only feature for tracking typetree, not used in GCC
         _tt: Option<FncTree>,
     ) {
         assert!(!flags.contains(MemFlags::NONTEMPORAL), "non-temporal memcpy not supported");

compiler/rustc_codegen_llvm/src/llvm/enzyme_ffi.rs

@@ -196,31 +196,31 @@ pub(crate) mod Fallback_AD {
 
     // TypeTree function fallbacks
     pub(crate) fn EnzymeNewTypeTree() -> CTypeTreeRef {
-        unimplemented!()
+        unsafe { unimplemented!() }
     }
 
     pub(crate) fn EnzymeNewTypeTreeCT(arg1: CConcreteType, ctx: &Context) -> CTypeTreeRef {
-        unimplemented!()
+        unsafe { unimplemented!() }
     }
 
     pub(crate) fn EnzymeNewTypeTreeTR(arg1: CTypeTreeRef) -> CTypeTreeRef {
-        unimplemented!()
+        unsafe { unimplemented!() }
     }
 
     pub(crate) fn EnzymeFreeTypeTree(CTT: CTypeTreeRef) {
-        unimplemented!()
+        unsafe { unimplemented!() }
     }
 
     pub(crate) fn EnzymeMergeTypeTree(arg1: CTypeTreeRef, arg2: CTypeTreeRef) -> bool {
-        unimplemented!()
+        unsafe { unimplemented!() }
     }
 
     pub(crate) fn EnzymeTypeTreeOnlyEq(arg1: CTypeTreeRef, pos: i64) {
-        unimplemented!()
+        unsafe { unimplemented!() }
     }
 
     pub(crate) fn EnzymeTypeTreeData0Eq(arg1: CTypeTreeRef) {
-        unimplemented!()
+        unsafe { unimplemented!() }
     }
 
     pub(crate) fn EnzymeTypeTreeShiftIndiciesEq(
@@ -230,15 +230,15 @@ pub(crate) mod Fallback_AD {
         max_size: i64,
         add_offset: u64,
     ) {
-        unimplemented!()
+        unsafe { unimplemented!() }
     }
 
     pub(crate) fn EnzymeTypeTreeToString(arg1: CTypeTreeRef) -> *const c_char {
-        unimplemented!()
+        unsafe { unimplemented!() }
     }
 
     pub(crate) fn EnzymeTypeTreeToStringFree(arg1: *const c_char) {
-        unimplemented!()
+        unsafe { unimplemented!() }
     }
 
     pub(crate) fn set_inline(val: bool) {