moonbitlang / core / 5111

Build # 5111

Build Type

push

github

Committed by bobzhang

Commit Message

Remove negative index support from view/slice operators

The `_[_:_]` slice operator and its sibling `get_view`/`mut_view` APIs
previously normalized negative indices as offsets from the end
(`if x < 0 { len + x }`). This removes that normalization across
String, StringView, Bytes, BytesView, Array, ArrayView, FixedArray and
MutArrayView so a negative index now falls through to the existing
bounds guard and is rejected (panic, or None for `get_view`), matching
the pre-existing behavior of `UninitializedArray::sub`.

Tests asserting negative-index view results are removed or converted to
equivalent positive indices; "panic negative index" tests are retained
and now verify that negatives are rejected.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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