src/test/ui-fulldeps/proc-macro/parent-source-spans.rs

   1 // Copyright 2018 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 // aux-build:parent-source-spans.rs
  12 // ignore-stage1
  13
  14 #![feature(proc_macro, decl_macro, proc_macro_non_items)]
  15
  16 extern crate parent_source_spans;
  17
  18 use parent_source_spans::parent_source_spans;
  19
  20 macro one($a:expr, $b:expr) {
  21     two!($a, $b);
  22     //~^ ERROR first parent: "hello"
  23     //~| ERROR second parent: "world"
  24 }
  25
  26 macro two($a:expr, $b:expr) {
  27     three!($a, $b);
  28     //~^ ERROR first final: "hello"
  29     //~| ERROR second final: "world"
  30     //~| ERROR first final: "yay"
  31     //~| ERROR second final: "rust"
  32 }
  33
  34 // forwarding tokens directly doesn't create a new source chain
  35 macro three($($tokens:tt)*) {
  36     four!($($tokens)*);
  37 }
  38
  39 macro four($($tokens:tt)*) {
  40     parent_source_spans!($($tokens)*);
  41 }
  42
  43 fn main() {
  44     one!("hello", "world");
  45     //~^ ERROR first grandparent: "hello"
  46     //~| ERROR second grandparent: "world"
  47     //~| ERROR first source: "hello"
  48     //~| ERROR second source: "world"
  49
  50     two!("yay", "rust");
  51     //~^ ERROR first parent: "yay"
  52     //~| ERROR second parent: "rust"
  53     //~| ERROR first source: "yay"
  54     //~| ERROR second source: "rust"
  55
  56     three!("hip", "hop");
  57     //~^ ERROR first final: "hip"
  58     //~| ERROR second final: "hop"
  59     //~| ERROR first source: "hip"
  60     //~| ERROR second source: "hop"
  61 }