https://issues.dlang.org/show_bug.cgi?id=14725
Issue ID: 14725 Summary: std.getopt: improve error message for malformed arguments Product: D Version: D2 Hardware: x86_64 OS: Linux Status: NEW Severity: enhancement Priority: P1 Component: phobos Assignee: nob...@puremagic.com Reporter: initrd...@gmail.com When parsing an argument that isn't a string (ex. an int), getopt just uses `std.conv.to`, which throws a ConvException that's not very helpful to the end user. For example: import std.stdio; import std.getopt; import std.conv; void main(string[] args) { int num; GetoptResult helpinfo; try { helpinfo = getopt(args, "num", "An integer", &num, ); } catch(ConvException ex) { stderr.writeln("Error parsing arguments: ", ex.msg); return; } if(helpinfo.helpWanted) { defaultGetoptPrinter("I am help text", helpinfo.options); } } $ rdmd ~/test.d --num=foo Error parsing arguments: Unexpected 'o' when converting from type string to type int It would be nicer if getopt caught the ConvException, then threw a GetOptException with a more end-user-friendly message. For example: $ rdmd ~/test.d --num=foo Error parsing arguments: `num` was passed a non-integer value. --