[modules] Do basic linking.

src/messages.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // The infrastructure used for (localized) message reporting in V8.
 //
 // Note: there's a big unresolved issue about ownership of the data
 // structures used by this framework.
 
 #ifndef V8_MESSAGES_H_
@@ skipping 593 matching lines @@
   T(UnexpectedTailCallInForInOf, "Tail call expression in for-in/of body")     \
   T(UnexpectedTailCallInTryBlock, "Tail call expression in try block")         \
   T(UnexpectedTailCallOfEval, "Tail call of a direct eval is not allowed")     \
   T(UnexpectedTemplateString, "Unexpected template string")                    \
   T(UnexpectedToken, "Unexpected token %")                                     \
   T(UnexpectedTokenIdentifier, "Unexpected identifier")                        \
   T(UnexpectedTokenNumber, "Unexpected number")                                \
   T(UnexpectedTokenString, "Unexpected string")                                \
   T(UnexpectedTokenRegExp, "Unexpected regular expression")                    \
   T(UnknownLabel, "Undefined label '%'")                                       \
+  T(UnresolvableExport, "Module does not provide an export named '%'")         \

[adamk, 2016/09/23 00:39:10]

Can we not provide the module name along with the export name?

[neis, 2016/09/23 17:40:33]

Not without extra work. As discussed offline, we'll have to revisit error
reporting anyways.

   T(UnterminatedArgList, "missing ) after argument list")                      \
   T(UnterminatedRegExp, "Invalid regular expression: missing /")               \
   T(UnterminatedTemplate, "Unterminated template literal")                     \
   T(UnterminatedTemplateExpr, "Missing } in template expression")              \
   T(FoundNonCallableHasInstance, "Found non-callable @@hasInstance")           \
   T(InvalidHexEscapeSequence, "Invalid hexadecimal escape sequence")           \
   T(InvalidUnicodeEscapeSequence, "Invalid Unicode escape sequence")           \
   T(UndefinedUnicodeCodePoint, "Undefined Unicode code-point")                 \
   T(YieldInParameter, "Yield expression not allowed in formal parameter")      \
   /* EvalError */                                                              \
@@ skipping 63 matching lines @@
   static Handle<String> GetMessage(Isolate* isolate, Handle<Object> data);
   static std::unique_ptr<char[]> GetLocalizedMessage(Isolate* isolate,
                                                      Handle<Object> data);
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_MESSAGES_H_