test(melange): reproduce reason source location regression#14714
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Signed-off-by: Antonio Nuno Monteiro <anmonteiro@gmail.com>
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Signed-off-by: Antonio Nuno Monteiro <anmonteiro@gmail.com>
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Backport #14715 onto 3.24.0-rc. Fixes the melange build failure on OCaml 4.14 where dune emits an `I/O error: jscomp/runtime/.melange_src/X.mli: No such file or directory` against every `melange-re/melange.*-414` reverse dep (see ocaml/opam-repository#29996 — the 3.24.0~alpha2 release PR). The fix is to skip the line directive in `setup_melange_sources_copy_rules` when a module uses non-staged PPX, since the PPX pipeline now passes `-loc-filename` separately and adding the directive would double-shift diagnostics. The fix has a small precursor chain on `main`; bringing the headline `#14715` alone doesn't apply cleanly because subsequent PRs introduced the test files and machinery the fix's diff targets. Included PRs (chronological): - #14697 — test: show single context melange loses ppx snippet previews - #14698 — test: show single context reason+melange loses ppx snippet previews - #14708 — test: accept ppx loc-filename in fixtures - #14706 — **fix**: preserve original ppx source locations (introduces `-loc-filename`) - #14714 — test: reproduce reason source location regression - #14715 — **fix**: avoid line directive when passing `-loc-filename`
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