Forbid implicit nested statics in thread local statics

3 files changed, 13 insertions, 1 deletions

diff --git a/compiler/rustc_const_eval/messages.ftl b/compiler/rustc_const_eval/messages.ftl
index d6aae60c338..f6937dc145d 100644
--- a/compiler/rustc_const_eval/messages.ftl
+++ b/compiler/rustc_const_eval/messages.ftl
@@ -222,6 +222,7 @@ const_eval_mut_deref =
 
 const_eval_mutable_ptr_in_final = encountered mutable pointer in final value of {const_eval_intern_kind}
 
+const_eval_nested_static_in_thread_local = #[thread_local] does not support implicit nested statics, please create explicit static items and refer to them instead
 const_eval_non_const_fmt_macro_call =
     cannot call non-const formatting macro in {const_eval_const_context}s
 
diff --git a/compiler/rustc_const_eval/src/errors.rs b/compiler/rustc_const_eval/src/errors.rs
index 5c46ec799f1..a60cedd6500 100644
--- a/compiler/rustc_const_eval/src/errors.rs
+++ b/compiler/rustc_const_eval/src/errors.rs
@@ -25,6 +25,13 @@ pub(crate) struct DanglingPtrInFinal {
     pub kind: InternKind,
 }
 
+#[derive(Diagnostic)]
+#[diag(const_eval_nested_static_in_thread_local)]
+pub(crate) struct NestedStaticInThreadLocal {
+    #[primary_span]
+    pub span: Span,
+}
+
 #[derive(LintDiagnostic)]
 #[diag(const_eval_mutable_ptr_in_final)]
 pub(crate) struct MutablePtrInFinal {
diff --git a/compiler/rustc_const_eval/src/interpret/intern.rs b/compiler/rustc_const_eval/src/interpret/intern.rs
index f4e46c9499e..d0f0190fea7 100644
--- a/compiler/rustc_const_eval/src/interpret/intern.rs
+++ b/compiler/rustc_const_eval/src/interpret/intern.rs
@@ -28,7 +28,7 @@ use rustc_span::sym;
 
 use super::{AllocId, Allocation, InterpCx, MPlaceTy, Machine, MemoryKind, PlaceTy};
 use crate::const_eval;
-use crate::errors::{DanglingPtrInFinal, MutablePtrInFinal};
+use crate::errors::{DanglingPtrInFinal, MutablePtrInFinal, NestedStaticInThreadLocal};
 
 pub trait CompileTimeMachine<'mir, 'tcx: 'mir, T> = Machine<
         'mir,
@@ -108,6 +108,10 @@ fn intern_as_new_static<'tcx>(
     );
     tcx.set_nested_alloc_id_static(alloc_id, feed.def_id());
 
+    if tcx.is_thread_local_static(static_id.into()) {
+        tcx.dcx().emit_err(NestedStaticInThreadLocal { span: tcx.def_span(static_id) });
+    }
+
     // These do not inherit the codegen attrs of the parent static allocation, since
     // it doesn't make sense for them to inherit their `#[no_mangle]` and `#[link_name = ..]`
     // and the like.