Iterate/sort associative array by value?

[Julian]

On Monday, 8 April 2019 at 07:53:23 UTC, Robert M. Münch wrote:
> On 2019-04-07 19:28:02 +0000, Dennis said:
>
>> Did you import it? import std.algorithm;
>
> :-/ of course not...
>
> Why does DMD not give a hint, that an import from the standard 
> lib might be missing?

It does do this, so the question should be: why aren't its 
warnings
more extensive?

Example:

   void main() {
       writeln("Hello, world!");
   }

Fails to compile with this error:

   ./missing.d(4): Error: writeln is not defined, perhaps import 
std.stdio; is needed?

That seems to come from src/dmd/expressionsem.d , which uses 
importHint from
src/dmd/imphint.d , which just has this list:

   shared static this()
   {
       // in alphabetic order
       hints = [
           "calloc": "core.stdc.stdlib",
           "cos": "std.math",
           "fabs": "std.math",
           "free": "core.stdc.stdlib",
           "malloc": "core.stdc.stdlib",
           "printf": "core.stdc.stdio",
           "realloc": "core.stdc.stdlib",
           "sin": "std.math",
           "sqrt": "std.math",
           "writefln": "std.stdio",
           "writeln": "std.stdio",
           "__va_argsave_t": "core.stdc.stdarg",
           "__va_list_tag": "core.stdc.stdarg",
       ];
   }