error: expected `;`, found `#`
  --> $DIR/issue-118531-ice.rs:3:47
   |
LL |     #[cfg(feature = )]
   |     ------------------ only `;` terminated statements or tail expressions are allowed after this attribute
LL |     [1, 2, 3].iter().map().collect::<String>()
   |                                               ^ expected `;` here
LL |
LL |     #[attr]
   |     - unexpected token
   |
help: add `;` here
   |
LL |     [1, 2, 3].iter().map().collect::<String>();
   |                                               +
help: alternatively, consider surrounding the expression with a block
   |
LL |     { [1, 2, 3].iter().map().collect::<String>() }
   |     +                                            +

error[E0658]: attributes on expressions are experimental
  --> $DIR/issue-118531-ice.rs:5:5
   |
LL |     #[attr]
   |     ^^^^^^^
   |
   = 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   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date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: cannot find attribute `attr` in this scope
  --> $DIR/issue-118531-ice.rs:5:7
   |
LL |     #[attr]
   |       ^^^^

error: aborting due to 3 previous errors

For more information about this error, try `rustc --explain E0658`.