expr: adapt error messages, revert most of #5559 #5578
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GNU testsuite comparison: |
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thanks and sorry for jumping on the gun on the other PR |
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No problem, I would have merged it too :) |
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This PR is an alternative to #5575. It reverts most of #5559 and adapts the error messages to match those of GNU
expr. It also fails fast ifexpris called without any arguments.