Throw when calling an undefined function

src/parser.cc

Index: src/parser.cc
diff --git a/src/parser.cc b/src/parser.cc
index 9113e8c7a4e3ba46b936b38d1f4627ff0c426cf4..eaa1a6c136e7048596e345006837f697c06efb54 100644
--- a/src/parser.cc
+++ b/src/parser.cc
@@ -1071,7 +1071,7 @@ FunctionLiteral* Parser::DoParseProgram(ParseInfo* info) {
       // pre-existing bindings should be made writable, enumerable and
       // nonconfigurable if possible, whereas this code will leave attributes
       // unchanged if the property already exists.
-      InsertSloppyBlockFunctionVarBindings(scope, &ok);
+      InsertSloppyBlockFunctionVarBindings(scope, body, &ok);
     }
     if (ok && (is_strict(language_mode()) || allow_harmony_sloppy())) {
       CheckConflictingVarDeclarations(scope_, &ok);
@@ -4315,7 +4315,7 @@ FunctionLiteral* Parser::ParseFunctionLiteral(
                               CHECK_OK);
     }
     if (is_sloppy(language_mode) && allow_harmony_sloppy_function()) {
-      InsertSloppyBlockFunctionVarBindings(scope, CHECK_OK);
+      InsertSloppyBlockFunctionVarBindings(scope, body, CHECK_OK);
     }
     if (is_strict(language_mode) || allow_harmony_sloppy()) {
       CheckConflictingVarDeclarations(scope, CHECK_OK);
@@ -5003,7 +5003,7 @@ void Parser::InsertShadowingVarBindingInitializers(Block* inner_block) {
 }
 
 
-void Parser::InsertSloppyBlockFunctionVarBindings(Scope* scope, bool* ok) {
+void Parser::InsertSloppyBlockFunctionVarBindings(Scope* scope, ZoneList<Statement*>* body, bool* ok) {
   // For each variable which is used as a function declaration in a sloppy
   // block,
   DCHECK(scope->is_declaration_scope());
@@ -5021,6 +5021,17 @@ void Parser::InsertSloppyBlockFunctionVarBindings(Scope* scope, bool* ok) {
       DCHECK(ok);  // Based on the preceding check, this should not fail
       if (!ok) return;
 
+      // For testing, insert an initializing assignment to the function
+      // setting it to "throwLittleDan".
+      VariableProxy* littledanVariable = scope_->NewUnresolved(
+              factory(), ast_value_factory()->throwLittleDan_string(), Variable::NORMAL,
+              RelocInfo::kNoPosition, RelocInfo::kNoPosition);
+      Assignment* littledanAssignment = factory()->NewAssignment(
+          Token::ASSIGN, proxy, littledanVariable, RelocInfo::kNoPosition);
+      Statement* littledanStatement = factory()->NewExpressionStatement(
+            littledanAssignment, RelocInfo::kNoPosition);
+      body->InsertAt(0, littledanStatement, zone());
+
       // Write in assignments to var for each block-scoped function declaration
       auto delegates = static_cast<SloppyBlockFunctionMap::Vector*>(p->value);
       for (SloppyBlockFunctionStatement* delegate : *delegates) {