19 lines
738 B
Markdown
19 lines
738 B
Markdown
Currently, a RevertableProperty's Properties always both HasInfo. This
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means that if a Property NoInfo is updated to be a RevertableProperty, and
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someplace called ensureProperty on it, that will refuse to compile.
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The workaround is generally to export the original NoInfo property under
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a different name, so it can still be used with ensureProperty.
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This could be fixed:
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data RevertableProperty i1 i2 where
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RProp :: Property i1 -> Property i2 -> RevertableProperty i1 i2
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However, needing to write "RevertableProperty HasInfo NoInfo" is quite
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a mouthful!
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Since only 2 places in the propellor source code currently need to deal
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with this, it doesn't currently seem worth making the change, unless a less
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intrusive way can be found.
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