&&& was accidentally available as a valid prefix operator.

releasenotes.md

@@ -35,6 +35,7 @@
 - Error when using named argument on trailing macro body expansion #2139.
 - Designated const initializers with `{}` would overwrite the parent field.
 - Empty default case in @jump switch does not fallthrough #2147.
+- `&&&` was accidentally available as a valid prefix operator.
 
 ### Stdlib changes
 - Added `String.quick_ztr` and `String.is_zstr`

src/compiler/parse_expr.c

@@ -703,7 +703,13 @@ static Expr *parse_unary_expr(ParseContext *c, Expr *left)
 
 	bool is_bangbang = tok_is(c, TOKEN_BANGBANG);
 	Expr *unary = EXPR_NEW_TOKEN(EXPR_UNARY);
+	if (c->tok == TOKEN_CT_AND)
+	{
+		PRINT_ERROR_HERE("'&&&' is the compile time '&&' operator. If you want to take a temp address of an address, use () or space to clarify the intent, e.g. '&&(&a)'.");
+		return poisoned_expr;
+	}
 	unary->unary_expr.operator = unaryop_from_token(c->tok);
+	ASSERT(unary->unary_expr.operator != UNARYOP_ERROR);
 	advance(c);
 	Expr *right_side = parse_precedence(c, PREC_UNARY);
 

test/test_suite/expressions/addr_fail_2.c3

@@ -0,0 +1,10 @@
+import std;
+
+fn int main()
+{
+	// This works
+	int** my_super_cool_pointer = &&(&&1);
+	// This doesn't
+	int** my_super_cool_pointer2 = &&&&1; // #error: '&&&' is the compile time '&&' operator
+	return 0;
+}