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Auto merge of #116047 - a-lafrance:I80836-codegen-test, r=Mark-Simula…
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Add codegen test to guard against VecDeque optimization regression

Very small PR that adds a codegen test to guard against regression for the `VecDeque` optimization addressed in #80836. Ensures that Rustc optimizes away the panic when unwrapping the result of `.get(0)` because of the `!is_empty()` condition.
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bors committed Sep 23, 2023
2 parents 3050938 + d5ec9af commit 19c6502
Showing 1 changed file with 17 additions and 0 deletions.
17 changes: 17 additions & 0 deletions tests/codegen/vecdeque-nonempty-get-no-panic.rs
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// Guards against regression for optimization discussed in issue #80836

// compile-flags: -O
// ignore-debug: the debug assertions get in the way

#![crate_type = "lib"]

use std::collections::VecDeque;

// CHECK-LABEL: @front
// CHECK: ret void
#[no_mangle]
pub fn front(v: VecDeque<usize>) {
if !v.is_empty() {
v.get(0).unwrap();
}
}

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