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Union tag gets assigned wrong value in some very specific cases #1381

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Hejsil opened this Issue Aug 17, 2018 · 0 comments

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Hejsil commented Aug 17, 2018

This is the smallest test case I could come up with:

const B = union(enum) {
    D: u8,
    E: u14,
};

const A = union(enum) {
    B: B,
    C: u8,
};

test "" {
    var as =
        []A{
            A{ .B = B{ .D = 1 }},
            A{ .B = B{ .D = 1 }},
        };

    const a = as[0].B;
}
Test 1/1 ...access of inactive union field
test.zig:18:20: 0x203094 in ??? (test)
    const a = as[0].B;
  • Remove an element from the array and the test pass
  • Remove C or E and the test pass
  • Change active field of B to E on the first element of the array and the test pass

@andrewrk andrewrk added this to the 0.3.0 milestone Aug 17, 2018

@andrewrk andrewrk added the bug label Aug 17, 2018

@andrewrk andrewrk closed this in dd1338b Sep 11, 2018

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