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+error[E0658]: rust-call ABI is subject to change
+ --> $DIR/feature-gate-unboxed-closures.rs:10:12
+ |
+LL | extern "rust-call" fn call_once(self, (a, b): (u32, u32)) -> u32 {
+ | ^^^^^^^^^^^
+ |
+ = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
+ = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
+
+error[E0658]: the precise format of `Fn`-family traits' type parameters is subject to change
+ --> $DIR/feature-gate-unboxed-closures.rs:5:6
+ |
+LL | impl FnOnce<(u32, u32)> for Test {
+ | ^^^^^^^^^^^^^^^^^^
+ |
+ = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
+ = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
+
+error[E0183]: manual implementations of `FnOnce` are experimental
+ --> $DIR/feature-gate-unboxed-closures.rs:5:6
+ |
+LL | impl FnOnce<(u32, u32)> for Test {
+ | ^^^^^^^^^^^^^^^^^^ manual implementations of `FnOnce` are experimental
+ |
+ = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
+
+error: aborting due to 3 previous errors
+
+Some errors have detailed explanations: E0183, E0658.
+For more information about an error, try `rustc --explain E0183`.