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checks: exclude nil function name from error messages - #70
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When a checked function has no statically-resolved name (for example, it is called from C via pcall, or through the callable module table), debug.getinfo() reports a nil name, which was formatted into the message as "to nil". Format the " to <name>" part separately and omit it when the name is unknown. Closes #61
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When a checked function has no statically-resolved name (for example, it is called from C via pcall, or through the callable module table), debug.getinfo() reports a nil name, which was formatted into the message as "to nil".
Format the " to " part separately and omit it when the name is unknown.
Closes #61