• dolio's avatar
    Modify IsString String instance (fixes #10814) · b225b234
    dolio authored
    The new instance resolves to `s ~ [Char]` as soon as we know that `s ~
    [a]`, to avoid certain functions (like (++)) causing a situation where
    `a` is ambiguous and (currently) unable to be defaulted.
    Reviewers: #core_libraries_committee, hvr, austin, bgamari
    Reviewed By: hvr, bgamari
    Subscribers: thomie
    Differential Revision: https://phabricator.haskell.org/D1572
    GHC Trac Issues: #10814
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