Fix #5: Give better error message
Give a better error message when using T clause in case error.lisp: o Add new invalid-case condition to handle errors from case expressions. macros.lisp: o Use new invalid-case condition to signal the invalid usage of T in CASE expressions. o Replace old message with better, more informative, message. Include xref to ANSI CL spec. exports.lisp: o Export INVALID-CASE from KERNEL package.
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