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test(module-compilation): show missing location snippet for ppxed files #12770

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Merged
anmonteiro merged 1 commit into from
Nov 22, 2025
Merged

test(module-compilation): show missing location snippet for ppxed files #12770

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40 changes: 40 additions & 0 deletions test/blackbox-tests/test-cases/melange/ppx-preview.t
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Original file line number Diff line number Diff line change
@@ -0,0 +1,40 @@
Show PPX snippet preview is shown in Dune

$ mkdir -p lib
$ cat > dune-project <<EOF
> (lang dune 3.13)
> (using melange 0.1)
> EOF
$ cat > lib/dune <<EOF
> (library
> (name the_lib)
> (modes melange)
> (preprocess (pps melange.ppx)))
> EOF
$ cat > lib/the_lib.ml <<EOF
> let x: nope = "hello"
> EOF

$ cat > dune <<EOF
> (melange.emit
> (target output)
> (libraries the_lib)
> (emit_stdlib false))
> EOF

$ export DUNE_SANDBOX=symlink
$ dune build @melange
File "lib/the_lib.ml", line 1, characters 7-11:
Error: Unbound type constructor nope
[1]

Works if the sandbox is disabled

$ export DUNE_SANDBOX=none
$ dune build @melange
File "lib/the_lib.ml", line 1, characters 7-11:
1 | let x: nope = "hello"
^^^^
Error: Unbound type constructor nope
[1]

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