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[mutant 4/5] add(): commute operands (expect: survives, equivalent) #28

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[mutant 4/5] add(): commute operands (expect: survives, equivalent) #28

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7 changes: 6 additions & 1 deletion tests/charon_llbc/src/lib.rs
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Original file line number Diff line number Diff line change
@@ -1,9 +1,14 @@
//! Minimal Rust crate used to smoke-test the charon_llbc Bazel rule.
//! Kept deliberately small: `charon rustc --preset=aeneas` should translate
//! this without hitting any unsupported features.
//!
//! MUTANT #4 (mutation-testing spike, rules_lean#23): operands commuted in
//! `add`. Expect: SURVIVES, as an EQUIVALENT MUTANT (u32 addition is
//! commutative) — control case to validate the bucketing methodology itself,
//! not a real spec gap.

pub fn add(x: u32, y: u32) -> u32 {
x + y
y + x
}

pub fn identity(x: u64) -> u64 {
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