|  | // RUN: rm -rf %t | 
|  | // RUN: mkdir -p %t | 
|  |  | 
|  | // RUN: echo '@import B;' > %t/A.h | 
|  | // RUN: echo '@import C;' > %t/B.h | 
|  | // RUN: echo '@import D;' >> %t/B.h | 
|  | // RUN: echo '// C.h' > %t/C.h | 
|  | // RUN: echo '// D.h' > %t/D.h | 
|  | // RUN: echo 'module A { header "A.h" }' > %t/module.modulemap | 
|  | // RUN: echo 'module B { header "B.h" }' >> %t/module.modulemap | 
|  | // RUN: echo 'module C { header "C.h" }' >> %t/module.modulemap | 
|  | // RUN: echo 'module D { header "D.h" }' >> %t/module.modulemap | 
|  |  | 
|  | // RUN: %clang_cc1 -fmodules -fimplicit-module-maps -fmodules-cache-path=%t -I %t %s -verify | 
|  | // RUN: echo " " >> %t/D.h | 
|  | // RUN: %clang_cc1 -fmodules -fimplicit-module-maps -fmodules-cache-path=%t -I %t %s -verify | 
|  | // expected-no-diagnostics | 
|  |  | 
|  |  | 
|  | @import C; | 
|  | @import A; | 
|  | @import C; | 
|  | // When compiling A, C will be be loaded then removed when D fails. Ensure | 
|  | // this does not cause problems importing C again later. |