Create a new channel as a copy of main.
Rename main to:
Delete main? This cannot be undone.
// RUN: clang-import-test -import %S/Inputs/N1.cpp -import %S/Inputs/N2.cpp -import %S/Inputs/N3.cpp -expression %s void expr() { N::S s; N::T t; N::U u; int d = s.a + t.b + u.c; }