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17cbb4eb6b
Two fixes prompted by review of the swift-syntax switch-over.
Parser resolution (`parse.rs`): `parse_bin` now resolves the
`swift-syntax-parse` executable in priority order — the
`CODEQL_EXTRACTOR_UNIFIED_SWIFT_SYNTAX_PARSE` override, then a copy next
to the extractor executable (as a shipped extractor pack lays it out:
`tools/<platform>/{extractor,swift-syntax-parse}`), then a
bare `PATH` lookup. This lets a packaged extractor find its parser with
no environment setup. (Bundling the binary into the pack, together with
its Swift runtime, is a separate follow-up.)
Corpus test guard (`corpus_tests.rs`): `parser_available` previously
treated *any* parser error as "unavailable" and skipped the entire
corpus suite, so a parser that was present but crashed or emitted
invalid JSON would silently skip the exact regressions the suite exists
to catch. It now uses the new `binary_available`, which reports whether
the *executable* can be launched (false only when it cannot be found,
e.g. no Swift toolchain); a launchable-but-failing parser makes the
suite run and fail.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>