[modules] When determining the visible module set during template

instantiation, use the set of modules visible from the template definition, not
from whichever declaration the specialization was instantiated from.

llvm-svn: 241662

1 files changed, 4 insertions, 0 deletions

diff --git a/clang/test/Modules/Inputs/merge-template-pattern-visibility/module.modulemap b/clang/test/Modules/Inputs/merge-template-pattern-visibility/module.modulemap
new file mode 100644
index 00000000000..ba97abbaa8e
--- /dev/null
+++ b/clang/test/Modules/Inputs/merge-template-pattern-visibility/module.modulemap
@@ -0,0 +1,4 @@
+module X {
+  module A { header "a.h" }
+  module B { header "b.h" }
+}