mirror of https://github.com/rust-lang/rust
66 lines
2.2 KiB
Rust
66 lines
2.2 KiB
Rust
//@ aux-build:amputate-span.rs
|
|
//@ run-rustfix
|
|
//@ edition:2018
|
|
//@ compile-flags: --extern amputate_span
|
|
|
|
// This test has been crafted to ensure the following things:
|
|
//
|
|
// 1. There's a resolution error that prompts the compiler to suggest
|
|
// adding a `use` item.
|
|
//
|
|
// 2. There are no `use` or `extern crate` items in the source
|
|
// code. In fact, there is only one item, the `fn main`
|
|
// declaration.
|
|
//
|
|
// 3. The single `fn main` declaration has an attribute attached to it
|
|
// that just deletes the first token from the given item.
|
|
//
|
|
// You need all of these conditions to hold in order to replicate the
|
|
// scenario that yielded issue 87613, where the compiler's suggestion
|
|
// looks like:
|
|
//
|
|
// ```
|
|
// help: consider importing this struct
|
|
// |
|
|
// 47 | hey */ async use std::process::Command;
|
|
// | ++++++++++++++++++++++++++
|
|
// ```
|
|
//
|
|
// The first condition is necessary to force the compiler issue a
|
|
// suggestion. The second condition is necessary to force the
|
|
// suggestion to be issued at a span associated with the sole
|
|
// `fn`-item of this crate. The third condition is necessary in order
|
|
// to yield the weird state where the associated span of the `fn`-item
|
|
// does not actually cover all of the original source code of the
|
|
// `fn`-item (which is why we are calling it an "amputated" span
|
|
// here).
|
|
//
|
|
// Note that satisfying conditions 2 and 3 requires the use of the
|
|
// `--extern` compile flag.
|
|
//
|
|
// You might ask yourself: What code would do such a thing? The
|
|
// answer is: the #[tokio::main] attribute does *exactly* this (as
|
|
// well as injecting some other code into the `fn main` that it
|
|
// constructs).
|
|
|
|
#[amputate_span::drop_first_token]
|
|
/* what the
|
|
hey */ async fn main() {
|
|
Command::new("git"); //~ ERROR [E0433]
|
|
}
|
|
|
|
// (The /* ... */ comment in the above is not part of the original
|
|
// bug. It is just meant to illustrate one particular facet of the
|
|
// original non-ideal behavior, where we were transcribing the
|
|
// trailing comment as part of the emitted suggestion, for better or
|
|
// for worse.)
|
|
|
|
#[allow(dead_code)]
|
|
mod inner {
|
|
#[amputate_span::drop_first_token]
|
|
/* another interesting
|
|
case */ async fn foo() {
|
|
Command::new("git"); //~ ERROR [E0433]
|
|
}
|
|
}
|