[E0124] field x is already declared in struct

[MahadMuhammad]

A struct was declared with two fields having the same name - E0124

• On godbolt

---

Code tested from E0124:

// https://doc.rust-lang.org/error_codes/E0124.html
fn main() {
    struct Foo {
        field1: i32, // { dg-error "field .field1. is already declared" }
        field1: i32, // { dg-error "field .field1. is already declared" }
        field1: i32, // { dg-error "field .field1. is already declared" }
    }
}

---

Output:

➜  gccrs-build gcc/crab1 /home/mahad/Desktop/mahad/gccrs/gcc/testsuite/rust/execute/same_field_name.rs
/home/mahad/Desktop/mahad/gccrs/gcc/testsuite/rust/execute/same_field_name.rs:5:9: error: field ‘field1’ is already declared [E0124]
    4 |         field1: i32, // { dg-error "field .field1. is already declared" }
      |         ~~~~~~
    5 |         field1: i32, // { dg-error "field .field1. is already declared" }
      |         ^~~~~~

Analyzing compilation unit

Time variable                                   usr           sys          wall           GGC
 phase setup                        :   0.00 (  0%)   0.00 (  0%)   0.01 (100%)   138k ( 95%)
 TOTAL                              :   0.00          0.00          0.01          146k
Extra diagnostic checks enabled; compiler may run slowly.
Configure with --enable-checking=release to disable checks.

gcc/rust/ChangeLog:

* hir/rust-ast-lower-base.cc (struct_field_name_exists): called error function.

gcc/testsuite/ChangeLog:

* rust/execute/same_field_name.rs: New test.

[philberty]

LGTM