rust/tests/ui/feature-gates/issue-49983-see-issue-0.rs

extern crate core;

// error should not say "(see issue #0)"
#[allow(unused_imports)] use core::ptr::Unique; //~ ERROR use of unstable library feature

fn main() {}
don't see issue #0 The unstable-feature attribute requires an issue (neglecting it is E0547), which gets used in the error messages. Unfortunately, there are some cases where "0" is apparently used a placeholder where no issue exists, directing the user to see the (nonexistent) issue #0. (It would have been better to either let `issue` be optional—compare to how issue is an `Option<u32>` in the feature-gate declarations in libsyntax/feature-gate.rs—or actually require that an issue be created.) Rather than endeavoring to change how `#[unstable]` works at this time (given competing contributor and reviewer priorities), this simple patch proposes the less-ambitious solution of just not adding the "(see issue)" note when the number is zero. Resolves #49983. 2018-04-15 13:12:33 -05:00			`extern crate core;`

			`// error should not say "(see issue #0)"`
			`#[allow(unused_imports)] use core::ptr::Unique; //~ ERROR use of unstable library feature`

			`fn main() {}`