Added test and updated releasenotes for formatter changes.

releasenotes.md

@@ -35,6 +35,7 @@
 - Added @str_hash, @str_upper, @str_lower, @str_find compile time macros.
 - Remove "panic" text from unreachable() when safe mode is turned off.
 - Added `@unaligned_store` and `@unaligned_load`.
+- Null ZString, DString or pointer prints "(null)" for printf.
 
 ## 0.6.0 Change list
 

test/unit/stdlib/core/string.c3

@@ -12,6 +12,16 @@ fn void test_starts_with()
 	assert(!s.starts_with("o"));
 }
 
+fn void test_print_null()
+{
+	ZString z;
+	int* y;
+	ZString w = "hello";
+	String s = string::new_format("%s %s %s", z, w, y);
+	defer free(s);
+	assert(s == "(null) hello (null)");
+}
+
 fn void test_strip()
 {
 	String s = "ofke";