In the latest CVS M-. became slightly more convenient.
It’s now able to find definitions of symbols whose names are prefixed with punctuation, for example, some lisps produces warnings
In FOO: Undeclared free variable X
And pressing M-. on FOO tried to find “FOO:" before, now it sees that there’s no symbol named "FOO:”, it tries to find “FOO”.
This is controlled by two new variables, which can be customized in ~/.swank.lisp
*find-definitions-right-trim*, default value “,:.”
*find-definitions-left-trim*, default value “#:”.
All those are arguments to cl:string-x-trim.
With the default value for left-trim it’s now possible to use M-. on
#: symbols in package definitions.