Index of the delimiter closing the open_char at open_idx, or nil when the source runs out first. String and char literals are skipped, so a )/} inside "…" or '…' cannot close the block early.

Scan by CHARACTER (not byte): open_idx is a char index from String#index and callers char-slice with — or range-compare — the returned index. A byte scan corrupts both on multi-byte UTF-8. ASCII-identical to the previous byte loop.

Maven/Gradle pin test sources to src/test/<lang>/ — java, kotlin, scala, groovy all share the layout. Real route handlers never live there, but Quarkus, Micronaut, Spring, Javalin, JAX-RS and friends routinely declare inline controllers under src/test/java/... to exercise the framework. The path layout is part of the build tool's contract so the prefix check is unambiguous.

Also covers Maven's archetype source-roots (src/it/, integration-test convention used by some Quarkus extensions and Apache projects) which sit alongside src/test/.

Takes the scan-base-relative path (Analyzer#base_relative_path), never the absolute one. The layout is a contract between the build tool and the project, so matching the absolute path let a directory above the scan base decide the answer — a CI job that checks out under a src/test/ step directory silently lost 375 of the fixture tree's 396 endpoints.