Re: substitute with predicate won't compile

[Bastiaan Veelo via Digitalmars-d-learn]

On Tuesday, 28 October 2025 at 20:08:41 UTC, H. S. Teoh wrote:
On Tue, Oct 28, 2025 at 07:43:56PM +0000, Bastiaan Veelo via 
Digitalmars-d-learn wrote:
Why doesn't this compile?
```d
import std;

void main()
{
    string s;
    //...
    s = s.substitute!((a, b) => sicmp(a, b) == 0, "&", "&",
                                                  "&lt;", "<",
                                                  "&gt;", ">",
                                                  "&quot;", 
`"`,
                                                  "&apos;", 
"'").array;
}
```

You have all your arguments as CT arguments; I think 
.substitute wants the lamdba as a CT argument but the other 
arguments as RT.

But having said that, after changing the substitution arguments 
to RT arguments, it still doesn't compile for me for some 
reason.  So I dunno.


T

This seems to be a bug. It does work with runtime arguments, but 
only if the predicate is given as a string:
```d
    s = s.substitute!"a.toLower==b.toLower"("&amp;", "&",
                                            "&lt;", "<",
                                            "&gt;", ">",
                                            "&quot;", `"`,
                                            "&apos;", 
"'").to!string;
```

-- Bastiaan.