39 lines
1.2 KiB
Perl
39 lines
1.2 KiB
Perl
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This test can only work with OCaml 5.3 or higher.
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OCaml 5.3 introduced the new `effect` keyword. To allow old code to compile
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under 5.3 it also introduced a `-keyword=version+list` CLI option, allowing one to
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override the set of keywords.
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The ppxlib driver also has such an option now to properly configure the lexer before
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attempting to parse source code.
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Let's consider the following source file:
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$ cat > test.ml << EOF
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> let effect = 1
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> EOF
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If passed to the driver as is, it will trigger a parse error:
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$ ./driver.exe --impl test.ml -o ignore.ml
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File "test.ml", line 1, characters 4-10:
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1 | let effect = 1
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^^^^^^
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Error: Syntax error
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[1]
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Now, if we use the 5.2 set of keywords, it should happily handle the file:
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$ ./driver.exe --keywords 5.2 --impl test.ml -o ignore.ml
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It can also be set using OCAMLPARAM:
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$ OCAMLPARAM=_,keywords=5.2 ./driver.exe --impl test.ml -o ignore.ml
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The priority between the CLI option and OCAMLPARAM must be respected, therefore
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both of the following invocation should parse:
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$ OCAMLPARAM=_,keywords=5.2 ./driver.exe --keywords 5.3 --impl test.ml -o ignore.ml
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$ OCAMLPARAM=keywords=5.3,_ ./driver.exe --keywords 5.2 --impl test.ml -o ignore.ml
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