Fix issue with labelled break inside of a $switch.

releasenotes.md

@@ -17,6 +17,7 @@
 - Switch case with const non-int / enum would be treated as ints and crash. #2263
 - Missing bounds check on upper bound with const ranges `foo[1:3]`.
 - Check up the hierarchy when considering if an interface cast is valid #2267.
+- Fix issue with labelled break inside of a $switch.
 
 ### Stdlib changes
 

src/compiler/sema_stmts.c

@@ -2224,9 +2224,10 @@ static inline bool sema_analyse_then_overwrite(SemaContext *context, Ast *statem
 		return true;
 	}
 	Ast *last = NULL;
+	statement->ast_kind = AST_NOP_STMT;
 	AstId next = statement->next;
-	*statement = *astptr(replacement);
-	AstId current = astid(statement);
+	statement->next = replacement;
+	AstId current = replacement;
 	ASSERT(current);
 	while (current)
 	{

test/test_suite/compile_time/compile_time_with_break.c3t

@@ -0,0 +1,17 @@
+enum Test
+{
+    FOO,
+}
+
+fn int main()
+{
+	int v;
+    $switch (Test.FOO):
+    $case FOO:
+        if START: (v < 5)
+        {
+            if (v > 3) break START;
+        }
+    $endswitch
+    return 0;
+}