checker: allow for const source = $embed_file(@FILE).to_string()

vlib/v/checker/comptime.v

@@ -71,6 +71,11 @@ fn (mut c Checker) comptime_call(mut node ast.ComptimeCall) ast.Type {
 		if node.args.len == 1 {
 			embed_arg := node.args[0]
 			mut raw_path := ''
+			if embed_arg.expr is ast.AtExpr {
+				mut expr := embed_arg.expr
+				c.at_expr(mut expr)
+				raw_path = expr.val
+			}
 			if embed_arg.expr is ast.StringLiteral {
 				raw_path = embed_arg.expr.val
 			} else if embed_arg.expr is ast.Ident {

vlib/v/embed_file/tests/embed_file_self_test.v

@@ -0,0 +1,8 @@
+const self_file = $embed_file(@FILE)
+
+fn test_self_file() {
+	source := self_file.to_string()
+	assert source.contains('self_file.to_string')
+	assert source.contains('fn test_self_file() {')
+	assert source.split_into_lines().len > @LINE.int()
+}