no-core-2.rs

Author: Kivooeo

tests/ui/no_std/no-core-edition2018-syntax.rs

@@ -1,19 +1,27 @@
+//! Test that `#![no_core]` doesn't break modern Rust syntax in edition 2018.
+//!
+//! When you use `#![no_core]`, you lose the automatic prelude, but you can still
+//! get everything back by manually importing `use core::{prelude::v1::*, *}`.
+//! This test makes sure that after doing that, things like `for` loops and the
+//! `?` operator still work as expected.
+
 //@ run-pass
+//@ edition:2018
 
 #![allow(dead_code, unused_imports)]
 #![feature(no_core)]
 #![no_core]
-//@ edition:2018
 
-extern crate std;
 extern crate core;
-use core::{prelude::v1::*, *};
+extern crate std;
+use core::prelude::v1::*;
+use core::*;
 
-fn foo() {
+fn test_for_loop() {
     for _ in &[()] {}
 }
 
-fn bar() -> Option<()> {
+fn test_question_mark_operator() -> Option<()> {
     None?
 }