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Respect new_unchecked precondition in IndexRange proof harnesses #623

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Respect new_unchecked precondition in IndexRange proof harnesses #623

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8 changes: 8 additions & 0 deletions library/core/src/ops/index_range.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -250,6 +250,10 @@ mod verify {
fn proof_for_index_range_next_unchecked() {
let start = kani::any::<usize>();
let end = kani::any::<usize>();
// Respect new_unchecked's safety precondition (start <= end); the
// stronger requirement of next_unchecked (start < end) is assumed
// from its contract.
kani::assume(start <= end);
Comment on lines +253 to +256

@feliperodri feliperodri Aug 3, 2026

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shouldn't this be part of the requires clause for new_unchecked?


let mut range = unsafe { IndexRange::new_unchecked(start, end) };

Expand All @@ -260,6 +264,10 @@ mod verify {
fn proof_for_index_range_next_back_unchecked() {
let start = kani::any::<usize>();
let end = kani::any::<usize>();
// Respect new_unchecked's safety precondition (start <= end); the
// stronger requirement of next_back_unchecked (start < end) is
// assumed from its contract.
kani::assume(start <= end);

let mut range = unsafe { IndexRange::new_unchecked(start, end) };

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