Bug 11444 – Better error messages for Phobos ranges used without bang !

This is wrong code: import std.stdio, std.algorithm; void main() { "123".map(d => d - '0').writeln; } dmd 2.064beta gives the error messages: test.d(3): Error: template std.algorithm.map does not match any function template declaration. Candidates are: ...\dmd2\windows\bin\..\..\src\phobos\std\algorithm.d(398): std.algorithm.map(fun...) if (fun.length >= 1) test.d(3): Error: template std.algorithm.map(fun...) if (fun.length >= 1) cannot deduce template function from argument types !()(string, void) The mistake is in the map, it should be "map!(...)". Range-based code that uses map, filter and other similar functions is becoming common, so I suggest to add some euristics to the D front-end to generate better error messages for common Phobos templates that are used without the "!", something like: test.d(3): Error: template std.algorithm.map does not match any function template. Did you miss a "!"?

*** This issue has been marked as a duplicate of issue 9179 ***