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rust/tests/ui/pattern/box-pattern-constructor-mismatch.rs

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//! Test that `box _` patterns and `Box { .. }` patterns can't be used to match on the same place.
//! This is required for the current implementation of exhaustiveness analysis for deref patterns.
#![feature(box_patterns)]
fn main() {
match Box::new(0) {
box _ => {} //~ ERROR mix of deref patterns and normal constructors
Box { .. } => {}
}
}