gccrs: Improve operator overload check for recursive overload

This is a case in #2019 where you have the default Add impl for i32 for
example which has:

  impl Add for i32 {
    fn add(self, other:i32) { self + other }
  }

This function will do a check for operator overload which then is able to
find multiple candidates such as:

  impl<'a> Add<i32> for &'a i32 {
    type Output = <i32 as Add<i32>>::Output;

    fn add(self, other: i32) -> <i32 as Add<i32>>::Output {
        Add::add(*self, other)
    }
  }

This initial operator overload will resolve to this as it looks like a
valid candidate. This patch adds another level of checks to ensure the
candidate does not equal the current context DefId.

Addresses #2019

gcc/rust/ChangeLog:

	* typecheck/rust-hir-type-check-expr.cc: update for op overload

Signed-off-by: Philip Herron <herron.philip@googlemail.com>

0 files changed, 0 insertions, 0 deletions