gccrs: [E0124] field x is already declared in struct

Refactored error message for more
than one duplicate fields.

gcc/rust/ChangeLog:

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

gcc/testsuite/ChangeLog:

	* rust/compile/bad_pub_enumitems.rs: changed comment to pass test cases.
	* rust/compile/dup_fields.rs: likewise.
	* rust/execute/same_field_name.rs: New test.

Signed-off-by: Muhammad Mahad <mahadtxt@gmail.com>

gcc/rust/hir/rust-ast-lower-base.cc

@@ -681,7 +681,8 @@ struct_field_name_exists (std::vector<HIR::StructField> &fields,
 	{
 	  RichLocation r (new_field.get_locus ());
 	  r.add_range (field.get_locus ());
-	  rust_error_at (r, "duplicate field name %qs",
+	  rust_error_at (r, ErrorCode ("E0124"),
+			 "field %qs is already declared",
 			 field.get_field_name ().as_string ().c_str ());
 	  return true;
 	}

gcc/testsuite/rust/compile/bad_pub_enumitems.rs

@@ -18,7 +18,7 @@ enum E1
 enum E2
 {
   pub A (u8, i32, u64), // { dg-error "visibility qualifier" }
-  B { a: u8, a: u8 }  // { dg-error "duplicate field" }}
+  B { a: u8, a: u8 }  // { dg-error "field .a. is already declared" }}
 }
 
 fn main ()
@@ -41,7 +41,7 @@ fn main ()
 
   enum E2
     {
-      Alpha { a: u8, a: u8 },  // { dg-error "duplicate field" }}
+      Alpha { a: u8, a: u8 },  // { dg-error "field .a. is already declared" }}
       pub Beta (u8, i32, u64) // { dg-error "visibility qualifier" }
     }
 }

gcc/testsuite/rust/compile/dup_fields.rs

@@ -1,23 +1,23 @@
 struct S { a: i32, b: i32, c: u8, a: i128 }
-// { dg-error "duplicate field" "" { target *-*-* } .-1 }
+// { dg-error "field .a. is already declared" "" { target *-*-* } .-1 }
 
 union U
   {
     a: i32,
     b: i32,
     c: u8,
-    b: char // { dg-error "duplicate field" "" { target *-*-* } }
+    b: char // { dg-error "field .b. is already declared" "" { target *-*-* } }
   }
 
 fn main ()
 {
   struct SS { alpha: i32, beta: i32, gamma: u8, gamma: i128 }
-  // { dg-error "duplicate field" "" { target *-*-* } .-1 }
+  // { dg-error "field .gamma. is already declared" "" { target *-*-* } .-1 }
 
   union UU
     {
       alpha: i32, beta: i32,
       gamma: u8, beta: char
-      // { dg-error "duplicate field" "" { target *-*-* } .-1 }
+      // { dg-error "field .beta. is already declared" "" { target *-*-* } .-1 }
     }
 }

gcc/testsuite/rust/execute/same_field_name.rs

@@ -0,0 +1,8 @@
+// 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" }
+    }
+}