tests: add panic_with_cg.vv/.out

vlib/v/parser/fn.v

@@ -257,6 +257,7 @@ fn (mut p Parser) fn_decl() ast.FnDecl {
 		no_body: no_body
 		pos: start_pos.extend(end_pos)
 		body_pos: body_start_pos
+		file: p.file_name
 		is_builtin: p.builtin_mod || p.mod in util.builtin_module_parts
 		ctdefine: ctdefine
 	}

vlib/v/tests/inout/panic_with_cg.out

@@ -0,0 +1,6 @@
+================ V panic ================
+   module: buggy_function
+ function: buggy_function()
+  message: panicing...
+     file: vlib/v/tests/inout/panic_with_cg.v
+     line: 3

vlib/v/tests/inout/panic_with_cg.vv

@@ -0,0 +1,8 @@
+
+fn buggy_function() {
+	panic('panicing...')
+}
+
+fn main(){
+	buggy_function()    
+}