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+error[E0277]: the size for values of type `[i32]` cannot be known at compilation time
+ --> $DIR/issue-30276.rs:4:29
+ |
+LL | let _x: fn(_) -> Test = Test;
+ | ^^^^ doesn't have a size known at compile-time
+ |
+ = help: the trait `Sized` is not implemented for `[i32]`
+ = note: all function arguments must have a statically known size
+ = help: unsized fn params are gated as an unstable feature
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0277`.