tree 5ce892496d59bd44ea71a656278d26cf15f30d85
parent e30a1fe26e5e72cb7cb9f27d9abe2330e4115ae5
author Takuto Ikuta <tikuta@google.com> 1727168278 +0900
committer GN LUCI <gn-scoped@luci-project-accounts.iam.gserviceaccount.com> 1727231211 +0000

Improve error message for duplicated items

This changes error message like below
```
ERROR at //third_party/protobuf/proto_library.gni:506:29: Duplicate item in list
        public_configs += [ "${canonicalized_dep}_input_config" ]
                            ^----------------------------------
See //third_party/protobuf/proto_library.gni:506:29: This was the previous definition.
        public_configs += [ "${canonicalized_dep}_input_config" ]
                            ^----------------------------------
...
```
to
```
ERROR at //third_party/protobuf/proto_library.gni:506:29: Duplicate item "//third_party/perfetto/protos/perfetto/trace/track_event:cpp_input_config" in list.
        public_configs += [ "${canonicalized_dep}_input_config" ]
                            ^----------------------------------
See //third_party/protobuf/proto_library.gni:506:29: This was the previous definition.
        public_configs += [ "${canonicalized_dep}_input_config" ]
                            ^----------------------------------
...
```

Change-Id: Idc08c70f04ebcd9e276c2a2e46c3434e42a599d1
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/17800
Reviewed-by: David Turner <digit@google.com>
Commit-Queue: Takuto Ikuta <tikuta@google.com>