native test framework

compiler/ast/ast.odin

@@ -227,6 +227,7 @@ Function :: struct {
 	c_abi:      bool,
 	imported:   bool,
 	generated:  bool,
+	test:       bool,
 	file_hidden: bool,
 	has_body:   bool,
 	variadic:   bool,
@@ -276,6 +277,7 @@ Import :: struct {
 	target:     Package_Id,
 	valid:      bool,
 	used:       bool,
+	test_only:  bool,
 	diagnostic: source.Diagnostic_Id,
 }
 
@@ -310,9 +312,15 @@ Package :: struct {
 	path:      string,
 	name:      symbol.Id,
 	available: bool,
+	test:      bool,
 	kind:      Package_Kind,
 }
 
+Compile_Mode :: enum u8 {
+	Executable,
+	Test,
+}
+
 Package_Kind :: enum u8 {
 	Native,
 	C_Header,