fb81bff61f Add a from impl for ParseIntError (Tobin C. Harding)
2130150df6 absolute: Use Self in error type (Tobin C. Harding)
Pull request description:
While reviewing #2335 I noticed a few places that error code needed some love.
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Kixunil:
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Harshit933:
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apoelstra:
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Tree-SHA512: 17f4e448862be47534d4c1c2962d5db8f90a471e53226022d7c2e153fc501705cd65b070eb17f3239fb8ad242223340f78fe828ea7df3d43707d3e42fcbef557