Change:
<ins> error: an inner attribute is not permitted in this context --> $DIR/check-cfg_attr-ice.rs:60:9 | LL |         #![cfg_attr::no_such_thing] |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = note: inner attributes, like `#![no_std]`, annotate the item enclosing them, and are usually found at the beginning of source files = note: outer attributes, like `#[test]`, annotate the item following them error[E0658]: attributes on expressions are experimental --> $DIR/check-cfg_attr-ice.rs:45:9 | LL |         #[cfg_attr::no_such_thing] |         ^^^^^^^^^^^^^^^^^^^^^^^^^^ | = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date error[E0433]: failed to resolve: use of undeclared crate or module `cfg_attr` --> $DIR/check-cfg_attr-ice.rs:52:3 | LL | #[cfg_attr::no_such_thing] |   ^^^^^^^^ use of undeclared crate or module `cfg_attr` error[E0433]: failed to resolve: use of undeclared crate or module `cfg_attr` --> $DIR/check-cfg_attr-ice.rs:55:7 | LL |     #[cfg_attr::no_such_thing] |       ^^^^^^^^ use of undeclared crate or module `cfg_attr` error[E0433]: failed to resolve: use of undeclared crate or module `cfg_attr` --> $DIR/check-cfg_attr-ice.rs:57:17 | LL |     GiveYouUp(#[cfg_attr::no_such_thing] u8), |                 ^^^^^^^^ use of undeclared crate or module `cfg_attr` error[E0433]: failed to resolve: use of undeclared crate or module `cfg_attr` --> $DIR/check-cfg_attr-ice.rs:64:11 | LL |         #[cfg_attr::no_such_thing] |           ^^^^^^^^ use of undeclared crate or module `cfg_attr` error[E0433]: failed to resolve: use of undeclared crate or module `cfg_attr` --> $DIR/check-cfg_attr-ice.rs:41:7 | LL |     #[cfg_attr::no_such_thing] |       ^^^^^^^^ use of undeclared crate or module `cfg_attr` error[E0433]: failed to resolve: use of undeclared crate or module `cfg_attr` --> $DIR/check-cfg_attr-ice.rs:43:15 | LL |     fn from(#[cfg_attr::no_such_thing] any_other_guy: AnyOtherGuy) -> This { |               ^^^^^^^^ use of undeclared crate or module `cfg_attr` error[E0433]: failed to resolve: use of undeclared crate or module `cfg_attr` --> $DIR/check-cfg_attr-ice.rs:45:11 | LL |         #[cfg_attr::no_such_thing] |           ^^^^^^^^ use of undeclared crate or module `cfg_attr` error[E0433]: failed to resolve: use of undeclared crate or module `cfg_attr` --> $DIR/check-cfg_attr-ice.rs:32:3 | LL | #[cfg_attr::no_such_thing] |   ^^^^^^^^ use of undeclared crate or module `cfg_attr` error[E0433]: failed to resolve: use of undeclared crate or module `cfg_attr` --> $DIR/check-cfg_attr-ice.rs:24:3 | LL | #[cfg_attr::no_such_thing] |   ^^^^^^^^ use of undeclared crate or module `cfg_attr` error[E0433]: failed to resolve: use of undeclared crate or module `cfg_attr` --> $DIR/check-cfg_attr-ice.rs:27:7 | LL |     #[cfg_attr::no_such_thing] |       ^^^^^^^^ use of undeclared crate or module `cfg_attr` error[E0433]: failed to resolve: use of undeclared crate or module `cfg_attr` --> $DIR/check-cfg_attr-ice.rs:16:3 | LL | #[cfg_attr::no_such_thing] |   ^^^^^^^^ use of undeclared crate or module `cfg_attr` error[E0433]: failed to resolve: use of undeclared crate or module `cfg_attr` --> $DIR/check-cfg_attr-ice.rs:19:7 | LL |     #[cfg_attr::no_such_thing] |       ^^^^^^^^ use of undeclared crate or module `cfg_attr` error[E0433]: failed to resolve: use of undeclared crate or module `cfg_attr` --> $DIR/check-cfg_attr-ice.rs:12:3 | LL | #[cfg_attr::no_such_thing] |   ^^^^^^^^ use of undeclared crate or module `cfg_attr` error: aborting due to 15 previous errors Some errors have detailed explanations: E0433, E0658. For more information about an error, try `rustc --explain E0433`. </ins>

Discussion:
<!-- [31mICE[0m: Rustc '' 'error: internal compiler error: builtin attribute "cfgattr" not handled by ', 'error: internal compiler error: builtin attribute "cfgattr" not handled by ' File: --auto-reduced (treereduce-rust): original: Version information ` Command: <!-- Include a backtrace in the code block by setting in your environment. E.g. . --<details<summary<strongProgram output</strong</summary<p</p</details<!-- query stack: [checkmodattrs] checking attributes in top-level module [analysis] running analysis passes on this crate --