id,summary,reporter,owner,description,type,status,priority,milestone,component,version,resolution,keywords,cc,difficulty 74,Incorrect regexp in call to string-substitute causes random error rather than specific error message,Don Allen,Alex Shinn,"#;1> (string-substitute ""{12mp}"" ""TRUE"" ""{12mp}"" #t) Error: (car) bad argument type: () Call history: (string-substitute ""{12mp}"" ""TRUE"" ""{12mp}"" #t) (string-substitute ""{12mp}"" ""TRUE"" ""{12mp}"" #t) <-- #;1> The braces in the regexp are incorrect -- they needed backslashes -- but the resulting error is very unhelpful. The regexp is mal-formed, and the regexp compiler ought to say so.",defect,closed,major,,core libraries,4.1.x,fixed,,,