Commit 0af8d2b4 authored by Ralf Jung's avatar Ralf Jung
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dome more doc for gsubst

parent 33a49306
......@@ -12,6 +12,10 @@ unfolding any Coq definitions. For example:
For [gsubst e x ev] to work, [e] should not contain any opaque parts.
Fundamentally, the way this works is that [gsubst] tests whether a subterm
needs substitution, before it traverses into the term. This way, unaffected
sub-terms are returned directly, rather than their tree structure being
deconstructed and composed again.
The function [gsubst e x ev] differs in yet another way from [subst e x v].
The function [gsubst] substitutes an expression [ev] whereas [subst]
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