https://d.puremagic.com/issues/show_bug.cgi?id=11444
Summary: Better error messages for Phobos ranges used without
bang !
Product: D
Version: D2
Platform: All
OS/Version: All
Status: NEW
Keywords: diagnostic
Severity: enhancement
Priority: P2
Component: DMD
AssignedTo: [email protected]
ReportedBy: [email protected]
--- Comment #0 from [email protected] 2013-11-05 07:39:06 PST ---
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 "!"?
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