Consider the following code ...
class Foo { // 1
void foo() { // 2
bar(); // 3
this.bar(); // 4
} // 5
} // 6
void bar(Foo f) { // 7
import std.stdio; // 8
writeln("This bar"); // 9
} // 10
void main() { // 11
Foo test = new Foo; // 12
test.foo(); // 13
} // 14
DMD is fine with line 4 because of UFCS. But it gives an error for line 3 because it does not get this pointer to bind as argument.
I would expect even line 3 to compile.