Bug 9074 – Can't use range functions with Appender

import std.array; import std.range; void main() { // Error: casting string to char is deprecated // Error: static assert "Cannot put a dchar into a Appender!(string)" Appender!string x; x.put(repeat(" ").take(4)); // Error: casting string to dchar is deprecated Appender!dstring y; y.put(repeat(" ").take(4)); } It forces us to use `replicate`, which does allocation.

Different error now: ----- C:\dmd-git\dmd2\windows\bin\..\..\src\phobos\std\conv.d(3873): Error: static assert "immutable(char) cannot be emplaced from a string." C:\dmd-git\dmd2\windows\bin\..\..\src\phobos\std\array.d(2522): instantiated from here: emplaceRef!string test.d(9): instantiated from here: put!(Take!(Repeat!string)) ----- Anyone has ideas how to fix this (or if it should be fixed?).

(In reply to Andrej Mitrovic from comment #1) > Different error now: > > ----- > C:\dmd-git\dmd2\windows\bin\..\..\src\phobos\std\conv.d(3873): Error: static > assert "immutable(char) cannot be emplaced from a string." > C:\dmd-git\dmd2\windows\bin\..\..\src\phobos\std\array.d(2522): > instantiated from here: emplaceRef!string > test.d(9): instantiated from here: put!(Take!(Repeat!string)) > ----- > > Anyone has ideas how to fix this (or if it should be fixed?). Yeah, use the "actual" std.range.put: //---- void main() { // Error: casting string to char is deprecated // Error: static assert "Cannot put a dchar into a Appender!(string)" Appender!string x; put(x, repeat(" ", 4)); // Error: casting string to dchar is deprecated Appender!dstring y; put(y, repeat(" ").take(4)); } //---- This is why you should "never" use put "UFCS-style". Always "put(a, b)". Now, when all that is said and done, there's still an internal error, so it needs fixing. I don't think "Appender" should be able to handle this "natively" though. It should have given a "no matching function" error.

Ahh good catch. One of the rare downsides of UFCS.

Code in comment 2 works now with v2.072.2, closing.