[E0769] Use of struct or tuple variant in struct or struct variant

[MahadMuhammad]

Expected struct variant, found tuple struct/variant - E0769

A tuple struct or tuple variant was used in a pattern as if it were a struct or struct variant.

Code tested:

• gcc/testsuite/rust/compile/match4.rs

/home/mahad/Desktop/mahad/gccrs/gcc/testsuite/rust/compile/match4.rs:12:9: error: tuple variant ‘C’ written as struct variant [E0769]
   12 |         Foo::C { a } => {}
      |         ^~~
      |         use the tuple variant pattern syntax instead C(_)

---

gcc/rust/ChangeLog:

* typecheck/rust-hir-type-check-pattern.cc (TypeCheckPattern::visit): Added error code and rich location.

gcc/testsuite/ChangeLog:

* rust/compile/match4.rs: Updated new error commment.