Add bare-bracket rejection to Parser#expression in strict2 mode, so that
`['var']` is disallowed and `self['var']` is the required syntax.
- Add `Expression::SELF` constant ('self')
- Add `Parser#reject_bare_brackets` option, checked in `expression`
- Add `ParseContext#reject_bare_brackets?` and `force_reject_bare_brackets`
- Add `VariableLookupDrop` for `self['var']` scope-chain lookups
- Add `Variable#==` for rewriter state comparison
- Update `Context#find_variable` to return `VariableLookupDrop` for `self`
Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>
The pinned version (v1.273.0) does not have prebuilt `ruby-head` binaries
for `ubuntu-24.04`, which `ubuntu-latest` now resolves to. This causes CI
to fail with "Unavailable version head for ruby on ubuntu-24.04".
Updating to v1.295.0 picks up ubuntu-24.04 support for all Ruby versions
including head builds.
Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>
