rust/src/test/ui/feature-gate/issue-43106-gating-of-bench.rs

// error-pattern: `main` function not found

// At time of authorship, a crate-level #![bench] with no `--test`
// will cause compilation to error unconditionally with "main function
// not found" (despite having one), similar to #[bench].
//
// (The non-crate level cases are in
// issue-43106-gating-of-builtin-attrs.rs.)

// See issue-12997-1.rs and issue-12997-2.rs to see how `#[bench]` is
// handled in "weird places" when `--test` is passed.

#![feature(custom_inner_attributes)]

#![bench                   = "4100"]

fn main() { }