Compiler segfault when using bitwise not on number literal cast to bitstruct #2373.

releasenotes.md

@@ -19,6 +19,7 @@
 - Compiler assert when using generic parameters list without any parameters. #2369
 - Parsing difference between "0x00." and "0X00." literals #2371
 - Fixed bug generating `$c += 1` when `$c` was derived from a pointer but behind a cast.
+- Compiler segfault when using bitwise not on number literal cast to bitstruct #2373.
 
 ### Stdlib changes
 - Add `==` to `Pair`, `Triple` and TzDateTime. Add print to `Pair` and `Triple`.

src/compiler/sema_expr.c

@@ -8575,7 +8575,7 @@ static inline bool sema_expr_analyse_bit_not(SemaContext *context, Expr *expr, b
 	}
 
 VALID_VEC:
-	if (is_bitstruct && sema_cast_const(inner))
+	if (is_bitstruct && sema_cast_const(inner) && expr_is_const_initializer(inner))
 	{
 		expr_replace(expr, inner);
 		sema_invert_bitstruct_const_initializer(expr->const_expr.initializer);

test/test_suite/bitstruct/bitstruct_negate_cast.c3t

@@ -0,0 +1,12 @@
+// #target: macos-x64
+module test;
+bitstruct Foo : uint
+{
+	bool test : 2;
+}
+
+fn int main()
+{
+	~(Foo)2;
+	return 0;
+}