Sema: disallow indexing non-tuple struct

Fixes #15497

1 files changed, 7 insertions, 1 deletions

diff --git a/src/Sema.zig b/src/Sema.zig
index 327ff3800f..df199be97c 100644
--- a/src/Sema.zig
+++ b/src/Sema.zig
@@ -24597,10 +24597,15 @@ fn elemPtr(
     const indexable_ptr_src = src; // TODO better source location
     const indexable_ptr_ty = sema.typeOf(indexable_ptr);
     const target = sema.mod.getTarget();
+
     const indexable_ty = switch (indexable_ptr_ty.zigTypeTag()) {
         .Pointer => indexable_ptr_ty.elemType(),
         else => return sema.fail(block, indexable_ptr_src, "expected pointer, found '{}'", .{indexable_ptr_ty.fmt(sema.mod)}),
     };
+    if (!indexable_ty.isIndexable()) {
+        return sema.fail(block, src, "element access of non-indexable type '{}'", .{indexable_ty.fmt(sema.mod)});
+    }
+
     switch (indexable_ty.zigTypeTag()) {
         .Array, .Vector => return sema.elemPtrArray(block, src, indexable_ptr_src, indexable_ptr, elem_index_src, elem_index, init, oob_safety),
         .Struct => {
@@ -24629,10 +24634,11 @@ fn elemPtrOneLayerOnly(
 ) CompileError!Air.Inst.Ref {
     const indexable_src = src; // TODO better source location
     const indexable_ty = sema.typeOf(indexable);
+    const target = sema.mod.getTarget();
+
     if (!indexable_ty.isIndexable()) {
         return sema.fail(block, src, "element access of non-indexable type '{}'", .{indexable_ty.fmt(sema.mod)});
     }
-    const target = sema.mod.getTarget();
 
     switch (indexable_ty.ptrSize()) {
         .Slice => return sema.elemPtrSlice(block, src, indexable_src, indexable, elem_index_src, elem_index, oob_safety),