Bug 8310 – writeln of Range of fixed size array

import std.stdio: writeln; import std.algorithm: map; import std.array: array; void main() { char[2] two = ['a', 'b']; auto pieces = [1, 2].map!(x => two)(); writeln(pieces.array()); } It gives an acceptable output (dmd 2.060alpha): ["ab", "ab"] But printing the lazy range itself fails: import std.stdio: writeln; import std.algorithm: map; void main() { char[2] two = ['a', 'b']; auto pieces = [1, 2].map!(x => two)(); writeln(pieces); } ...\dmd2\src\phobos\std\format.d(1978): Error: template std.format.formatValue does not match any function template declaration ...\dmd2\src\phobos\std\format.d(1203): Error: template std.format.formatValue cannot deduce template function from argument types !()(LockingTextWriter,char[2u],FormatSpec!(char)) ...\dmd2\src\phobos\std\format.d(2006): Error: template std.format.formatValue does not match any function template declaration ...\dmd2\src\phobos\std\format.d(1203): Error: template std.format.formatValue cannot deduce template function from argument types !()(LockingTextWriter,char[2u],FormatSpec!(char)) ...\dmd2\src\phobos\std\format.d(2474): Error: template instance std.format.formatRange!(LockingTextWriter,Result,char) error instantiating ...\dmd2\src\phobos\std\format.d(2761): instantiated from here: formatValue!(LockingTextWriter,Result,char) ...\dmd2\src\phobos\std\format.d(420): instantiated from here: formatGeneric!(LockingTextWriter,Result,char) ...\dmd2\src\phobos\std\stdio.d(683): instantiated from here: formattedWrite!(LockingTextWriter,char,Result) ...\dmd2\src\phobos\std\stdio.d(1594): instantiated from here: write!(Result,char) test.d(6): instantiated from here: writeln!(Result) ...\dmd2\src\phobos\std\format.d(2761): Error: template instance std.format.formatValue!(LockingTextWriter,Result,char) error instantiating ...\dmd2\src\phobos\std\format.d(420): instantiated from here: formatGeneric!(LockingTextWriter,Result,char) ...\dmd2\src\phobos\std\stdio.d(683): instantiated from here: formattedWrite!(LockingTextWriter,char,Result) ...\dmd2\src\phobos\std\stdio.d(1594): instantiated from here: write!(Result,char) test.d(6): instantiated from here: writeln!(Result) ...\dmd2\src\phobos\std\format.d(420): Error: template instance std.format.formatGeneric!(LockingTextWriter,Result,char) error instantiating ...\dmd2\src\phobos\std\stdio.d(683): instantiated from here: formattedWrite!(LockingTextWriter,char,Result) ...\dmd2\src\phobos\std\stdio.d(1594): instantiated from here: write!(Result,char) test.d(6): instantiated from here: writeln!(Result) ...\dmd2\src\phobos\std\stdio.d(683): Error: template instance std.format.formattedWrite!(LockingTextWriter,char,Result) error instantiating ...\dmd2\src\phobos\std\stdio.d(1594): instantiated from here: write!(Result,char) test.d(6): instantiated from here: writeln!(Result) ...\dmd2\src\phobos\std\stdio.d(1594): Error: template instance std.stdio.File.write!(Result,char) error instantiating test.d(6): instantiated from here: writeln!(Result) test.d(6): Error: template instance std.stdio.writeln!(Result) error instantiating

Commits pushed to master at https://github.com/D-Programming-Language/phobos https://github.com/D-Programming-Language/phobos/commit/6c781f1ecf59a332ce842f7369aa3247a43956a0 fix Issue 8310 - writeln of Range of fixed size array https://github.com/D-Programming-Language/phobos/commit/886c384ba90016cb5b8e7491743d3e88bfa8f481 Merge pull request #652 from 9rnsr/fix8310 Issue 8310 - writeln of Range of fixed size array