std.conv: clean imports & parse (null and bool) fix

[9il]

Issue 13253 - use more scoped imports in phobos
See also: #2661

[quickfur]

Can we temporarily take out the changes to format and merge the other stuff in first? I'd like to get this PR in sooner rather than later, and don't really feel like waiting just because we haven't decided what to do with std.string.format yet.

[9il]

A am not alone :-)

       ///phobos / std / digest / digest.d
        body
        {
            enum string msg = "Buffer needs to be at least " ~ digestLength!(T).stringof ~ " bytes " ~
                "big, check " ~ typeof(this).stringof ~ ".length!";
            asArray!(digestLength!T)(buf, msg) = _digest.finish();
            return buf[0 .. digestLength!T];
        }

[9il]

std.conv and std.format are extensively used in CTFE.
Those code should be tiny for faster compilation of other projects including phobos.

[quickfur]

I'm pretty sure that code was from before std.format became CTFE-able. Quite a bit of effort was bit into making format CTFE-able. As @Dicebot said elsewhere, if there's a complexity issue with format, we should fix format instead of throwing it out and going back to IMO inferior ways of doing the same thing.

[9il]

@quickfur I gave up :-)
All format removals removed. Rebesed.

[quickfur]

What's the reason for this removal?

[9il]

This function is slower then common function for input range of dchar. See line 1840.

[quickfur]

I see.

[mihails-strasuns]

LGTM, thanks!

[mihails-strasuns]

Auto-merge toggled on

[quickfur]

Hmm. Not sure if it's this PR, or something else, that just broke the druntime tests. :-(

[mihails-strasuns]

How can phobos PR possibly break druntime tests?

[quickfur]

You're right, what was I thinking. Nevermind what I said.

mouth.open();
mouth.insert(foot);