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PATCH: document _default

In a github review, I made a suggestion of adding a call to _default.
The fact that it isn't explicitly mentioned in the documentation
elicited further queries. It is somewhat mentioned under special
contexts but you have to know that _default corresponds to -default-.

This adds a brief explanation.


diff --git a/Doc/Zsh/compsys.yo b/Doc/Zsh/compsys.yo
index 1adceb536..e65f2956b 100644
--- a/Doc/Zsh/compsys.yo
+++ b/Doc/Zsh/compsys.yo
@@ -4404,6 +4404,15 @@ Include the leading underscore (`tt(_)') in the matches.
+This function corresponds to the tt(-default-) special context which is
+applied where no completion is defined.  It is useful to call it under
+certain error conditions such as completion after an unrecognised
+subcommand.  This applies the concept of graceful degradation to the
+completion system, allowing it to fallback on basic completion of
+commonly useful things like filenames.
 redef(SPACES)(0)(tt(ifztexi(NOTRANS(@ @ @ @ @ @ @ @ @ @ ))ifnztexi(          )))
 xitem(tt(_describe )[tt(-12JVx)] [ tt(-oO) | tt(-t) var(tag) ] var(descr) var(name1) [ var(name2) ] [ var(opt) ... ])

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