get_all_attrs is not valid to call for all DefIds it seems.

Author: Keith-Cancel

compiler/rustc_hir_analysis/src/collect/type_of.rs

@@ -2,6 +2,7 @@ use core::ops::ControlFlow;
 
 use rustc_errors::{Applicability, StashKey, Suggestions};
 use rustc_hir::attrs::AttributeKind;
+use rustc_hir::def::DefKind;
 use rustc_hir::def_id::{DefId, LocalDefId};
 use rustc_hir::intravisit::VisitorExt;
 use rustc_hir::{self as hir, AmbigArg, HirId, find_attr};
@@ -423,7 +424,8 @@ fn infer_placeholder_type<'tcx>(
     let tcx = cx.tcx();
 
     fn is_type_const<'tcx>(tcx: TyCtxt<'tcx>, id: DefId) -> bool {
-        find_attr!(tcx.get_all_attrs(id), AttributeKind::TypeConst(_))
+        matches!(tcx.def_kind(id), DefKind::Const | DefKind::AssocConst)
+            && find_attr!(tcx.get_all_attrs(id), AttributeKind::TypeConst(_))
     }
 
     // If the type is omitted on a [type_const] we can't run

compiler/rustc_mir_build/src/builder/expr/as_constant.rs

@@ -3,6 +3,7 @@
 use rustc_abi::Size;
 use rustc_ast::{self as ast};
 use rustc_hir::attrs::AttributeKind;
+use rustc_hir::def::DefKind;
 use rustc_hir::def_id::DefId;
 use rustc_hir::{LangItem, find_attr};
 use rustc_middle::mir::interpret::{CTFE_ALLOC_SALT, LitToConstInput, Scalar};
@@ -51,7 +52,8 @@ pub(crate) fn as_constant_inner<'tcx>(
     let Expr { ty, temp_scope_id: _, span, ref kind } = *expr;
 
     fn is_type_const<'tcx>(tcx: TyCtxt<'tcx>, id: DefId) -> bool {
-        find_attr!(tcx.get_all_attrs(id), AttributeKind::TypeConst(_))
+        matches!(tcx.def_kind(id), DefKind::Const | DefKind::AssocConst)
+            && find_attr!(tcx.get_all_attrs(id), AttributeKind::TypeConst(_))
     }
 
     match *kind {