================
Comment at: include/clang/Basic/DiagnosticCommonKinds.td:89-90
@@ -87,1 +88,4 @@
+  "module '%0' %select{is incompatible with|requires}1 feature '%2'">;
+def err_module_header_missing : Error<
+  "%select{|umbrella }0header '%1' not found">;
 def err_module_lock_failure : Error<
----------------
benlangmuir wrote:
> When this diag was only used for @import it was okay because you get a 
> separate diagnostic telling you that the module build failed, so it was clear 
> what happened.
> 
> @import Foo; // error: header 'bar.h' not found
> // error: could not build module 'Foo'
> 
> But now it's odd to get an error about a different header than the one you 
> included with no indication that it's because of a module:
> 
> #include <foo.h> // error: header 'bar.h' not found
> 
> We could shoehorn the module name into the diagnostic, or perhaps emit a note 
> on the header decl in the module map file.
> 
Err, reading fail on my part, you're already emitting this at the header decl 
location.  Maybe we should have a note for the module import location though.

http://reviews.llvm.org/D10423

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