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After changing isNoEscape to look for no escape function in PackExpansionType, benign closures passed to functions with pack parameters would be errored as not able to convert, since they might escape. This seems to be because the expansion variable was not able to bind to noescape by default. I also added a test in pack_expansion covering this behavior, which may not be necessary. Before allowing expansion variables to bind to no escape, calling that function would fail to type check. I believe not setting this flag was not an issue in the past since it was not checked by isNoEscape?