PreParsing inner funcs: make scope analysis more complete.

src/parsing/parser.cc

Index: src/parsing/parser.cc
diff --git a/src/parsing/parser.cc b/src/parsing/parser.cc
index b3ec0388a9245009f655399b28cc44363aebcacb..c29aeae05a9d4ab4fa51d3313bbab5ed5972befd 100644
--- a/src/parsing/parser.cc
+++ b/src/parsing/parser.cc
@@ -1891,6 +1891,7 @@ void Parser::DesugarBindingInForEachStatement(ForInfo* for_info,
                                               Block** body_block,
                                               Expression** each_variable,
                                               bool* ok) {
+  DCHECK(for_info->parsing_result.declarations.length() == 1);

[marja, 2017/01/06 15:44:29]

Unrelated to this CL, but makes sense to add this.

   DeclarationParsingResult::Declaration& decl =
       for_info->parsing_result.declarations[0];
   Variable* temp = NewTemporary(ast_value_factory()->dot_for_string());