sumtype fails to match lambdas with anonymous arguments

[dlangBugzillaToGithub]

crazymonkyyy reported this on 2024-05-31T21:48:13Z

Transfered from https://issues.dlang.org/show_bug.cgi?id=24575

CC List

• alphaglosined

Description

```d
import std;
struct tree(T){
	alias node=typeof(this)[2]*;
	SumType!(T,node) data;
	bool isleaf()=>
		data.match!(
			(T)=>true,
			(node)=>false);
}
unittest{
	tree!int foo;
}
```

adding names to the lamdas arguments cause it to compile

[dlangBugzillaToGithub]

alphaglosined commented on 2024-05-31T22:02:20Z

This is expected behavior.

Those lambdas are templates, adding names stops that.