If I save this program on Windows (with the typical newlines used on Windows):


import std.stdio: writeln;
import std.string: outdent;
string foo() /*pure nothrow*/ {
    return q{
              first line
              second line
              third line
            }.outdent;
}
void main() {
    writeln(foo());
}


It outputs double newlines:


first line

second line

third line


Also std.string.outdent() is not pure nor nothrow.