Re: The poor state of documentation of pcase like things.

[Michael Heerdegen]

Richard Stallman <address@hidden> writes:

> Could someone report on what the current meaning of _ is?
> How is it actually used in pcase?

It's one of the pcase pattern types.  It matches anything.  That's all.
See the doc of `pcase'.


Apart from pcase, AFAIK the symbol _ is not special at all, it's just a
symbol.

But the byte compiler suppresses some warnings for symbols whose names
start with a _, in particular, about unused variables.  It is also
allowed to use `_' multiple times in the argument list of a function.

The intended usage is to give function arguments a name starting with _
(including `_' itself) when they are ignored by the function.


Michael.