Improve documentation string for 'compilation-error-regexp-alist'.

* lisp/progmodes/compile.el (compilation-error-regexp-alist): Clarify
behavior when TYPE is a cons cell.

diff --git a/lisp/progmodes/compile.el b/lisp/progmodes/compile.el
index 73f98068110fa354d17610e3d2c29e71f7f4906d..ac26f5e9341e5459c583a89fa1ef1a2b302788af 100644 (file)
--- a/lisp/progmodes/compile.el
+++ b/lisp/progmodes/compile.el
@@ -662,7 +662,8 @@ has just been matched, and should correspondingly preserve this match data.
 TYPE is 2 or nil for a real error or 1 for warning or 0 for info.
 TYPE can also be of the form (WARNING . INFO).  In that case this
 will be equivalent to 1 if the WARNING'th subexpression matched
-or else equivalent to 0 if the INFO'th subexpression matched.
+or else equivalent to 0 if the INFO'th subexpression matched,
+or else equivalent to 2 if neither of them matched.
 See `compilation-error-face', `compilation-warning-face',
 `compilation-info-face' and `compilation-skip-threshold'.