src/test/ui/proc-macro/issue-75930-derive-cfg.rs

   1 // check-pass
   2 // compile-flags: -Z span-debug --error-format human
   3 // aux-build:test-macros.rs
   4
   5 // Regression test for issue #75930
   6 // Tests that we cfg-strip all targets before invoking
   7 // a derive macro
   8 // We need '--error-format human' to stop compiletest from
   9 // trying to interpret proc-macro output as JSON messages
  10 // (a pretty-printed struct may cause a line to start with '{' )
  11 // FIXME: We currently lose spans here (see issue #43081)
  12
  13 #![no_std] // Don't load unnecessary hygiene information from std
  14 extern crate std;
  15
  16 #[macro_use]
  17 extern crate test_macros;
  18
  19 #[print_helper(a)] //~ WARN derive helper attribute is used before it is introduced
  20                    //~| WARN this was previously accepted
  21 #[cfg_attr(not(FALSE), allow(dead_code))]
  22 #[print_attr]
  23 #[derive(Print)]
  24 #[print_helper(b)]
  25 struct Foo<#[cfg(FALSE)] A, B> {
  26     #[cfg(FALSE)] first: String,
  27     #[cfg_attr(FALSE, deny(warnings))] second: bool,
  28     third: [u8; {
  29         #[cfg(FALSE)] struct Bar;
  30         #[cfg(not(FALSE))] struct Inner;
  31         #[cfg(FALSE)] let a = 25;
  32         match true {
  33             #[cfg(FALSE)] true => {},
  34             #[cfg_attr(not(FALSE), allow(warnings))] false => {},
  35             _ => {}
  36         };
  37
  38         #[print_helper(should_be_removed)]
  39         fn removed_fn() {
  40             #![cfg(FALSE)]
  41         }
  42
  43         #[print_helper(c)] #[cfg(not(FALSE))] fn kept_fn() {
  44             #![cfg(not(FALSE))]
  45             let my_val = true;
  46         }
  47
  48         enum TupleEnum {
  49             Foo(
  50                 #[cfg(FALSE)] u8,
  51                 #[cfg(FALSE)] bool,
  52                 #[cfg(not(FALSE))] i32,
  53                 #[cfg(FALSE)] String, u8
  54             )
  55         }
  56
  57         struct TupleStruct(
  58             #[cfg(FALSE)] String,
  59             #[cfg(not(FALSE))] i32,
  60             #[cfg(FALSE)] bool,
  61             u8
  62         );
  63
  64         fn plain_removed_fn() {
  65             #![cfg_attr(not(FALSE), cfg(FALSE))]
  66         }
  67
  68         0
  69     }],
  70     #[print_helper(d)]
  71     fourth: B
  72 }
  73
  74 fn main() {}