strange behavior with unused variables

[Anton-4]

expect
    patternMatch = \input ->
        when input is
            [Fo, Bar, Baz] -> Bingo
            _ -> Other

    first = (patternMatch [Fo, Bar, Baz] == Bingo)
    #second = (patternMatch [Fo, Bar, Baz, D] != Bingo)

    first

This passes with roc test, but this doesn't:

expect
    patternMatch = \input ->
        when input is
            [Fo, Bar, Baz] -> Bingo
            _ -> Other

    first = (patternMatch [Fo, Bar, Baz] == Bingo)
    second = (patternMatch [Fo, Bar, Baz, D] != Bingo)

    first

Output:

── EXPECT FAILED ─ ...os/examples/examples/PatternMatching/PatternMatching.roc ─

This expectation failed:

24│>  expect
25│>      patternMatch = \input ->
26│>          when input is
27│>              [Fo, Bar, Baz] -> Bingo
28│>              _ -> Other
29│>
30│>      first = (patternMatch [Fo, Bar, Baz] == Bingo)
31│>      second = (patternMatch [Fo, Bar, Baz, D] != Bingo)
32│>
33│>      first

When it failed, these variables had these values:

first : Bool
first = Bool.false

second : Bool
second = Bool.true



1 failed and 0 passed in 230 ms.

Note that second is not used so it is not supposed to change anything 😄 .

@ayazhafiz this error was introduced with PR #5317, or commit 12b2f7e

[ayazhafiz]

This is due to #5354

[JRI98]

No longer reproduces

[Anton-4]

Thanks @JRI98 :)