Enable MemberImportVisibility check on 6.0+ pipelines

Author: rnro

.github/workflows/main.yml

@@ -17,6 +17,6 @@ jobs:
       # has a non-sendable global property.
       linux_5_10_arguments_override: "-Xswiftc -warnings-as-errors --explicit-target-dependency-import-check error"
       # TODO: Enable warnings-as-errors on 6.0.
-      linux_6_0_arguments_override: "-Xswiftc -strict-concurrency=complete --explicit-target-dependency-import-check error"
-      linux_nightly_6_0_arguments_override: "-Xswiftc -strict-concurrency=complete --explicit-target-dependency-import-check error"
-      linux_nightly_main_arguments_override: "-Xswiftc -strict-concurrency=complete --explicit-target-dependency-import-check error"
+      linux_6_0_arguments_override: "-Xswiftc -strict-concurrency=complete --explicit-target-dependency-import-check error -Xswiftc -enable-upcoming-feature -Xswiftc MemberImportVisibility"
+      linux_nightly_6_0_arguments_override: "-Xswiftc -strict-concurrency=complete --explicit-target-dependency-import-check error -Xswiftc -enable-upcoming-feature -Xswiftc MemberImportVisibility"
+      linux_nightly_main_arguments_override: "-Xswiftc -strict-concurrency=complete --explicit-target-dependency-import-check error -Xswiftc -enable-upcoming-feature -Xswiftc MemberImportVisibility"

.github/workflows/pull_request.yml

@@ -21,9 +21,9 @@ jobs:
       # has a non-sendable global property.
       linux_5_10_arguments_override: "-Xswiftc -warnings-as-errors --explicit-target-dependency-import-check error"
       # TODO: Enable warnings-as-errors on 6.0.
-      linux_6_0_arguments_override: "-Xswiftc -strict-concurrency=complete --explicit-target-dependency-import-check error"
-      linux_nightly_6_0_arguments_override: "-Xswiftc -strict-concurrency=complete --explicit-target-dependency-import-check error"
-      linux_nightly_main_arguments_override: "-Xswiftc -strict-concurrency=complete --explicit-target-dependency-import-check error"
+      linux_6_0_arguments_override: "-Xswiftc -strict-concurrency=complete --explicit-target-dependency-import-check error -Xswiftc -enable-upcoming-feature -Xswiftc MemberImportVisibility"
+      linux_nightly_6_0_arguments_override: "-Xswiftc -strict-concurrency=complete --explicit-target-dependency-import-check error -Xswiftc -enable-upcoming-feature -Xswiftc MemberImportVisibility"
+      linux_nightly_main_arguments_override: "-Xswiftc -strict-concurrency=complete --explicit-target-dependency-import-check error -Xswiftc -enable-upcoming-feature -Xswiftc MemberImportVisibility"
 
   cxx-interop:
     name: Cxx interop