toLower

[FeepingCreature]

On Tuesday, 15 August 2023 at 16:47:36 UTC, Joel wrote:
> How come toLower works in the sort quotes, but not in the map?
>
> ```d
> void main() {
>     import std;
>     "EzraTezla"
>         .to!(char[])
>         .byCodeUnit
>         .sort!"a.toLower<b.toLower"
>         .map!(c => c.toLower)
>         .writeln;
> }
> ```
>
When you pass a string to a lambda, it's evaluated in 
`std.functional.unaryFun`/`binaryFun`.

At that point, these modules are imported for use in string 
expressions:

```
import std.algorithm, std.conv, std.exception, std.math, 
std.range, std.string;
import std.meta, std.traits, std.typecons;
```

And `std.string` itself publically imports:

```
public import std.uni : icmp, toLower, toLowerInPlace, toUpper, 
toUpperInPlace;
```

But does *not* import `std.ascii`! So there's no ambiguity inside 
the `sort` string expression between the two `toLower` functions..