tree: improve panic information when a catch-all wildcard conflict occurs #1529
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sync httprouter patch: julienschmidt/httprouter#182
updated before:
panic: path segment '/foo' conflicts with existing wildcard '/*you' in path '/who/are/foo'
updated after:
panic: '/foo' in new path '/who/are/foo' conflicts with existing wildcard '/*you' in existing prefix '/who/are/*you'