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14.247 Substitution produces non-meta-term

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Origin: check. Landing-place: diagnose.

Substitution of x with v produces non-meta-term

As an example, substitution of #y by All #x : #x in 1 + #y yields the illformed metaterm 1 + All #x : #x. The error may indicate an error in the proof or a bug in a tactic.

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