LibJS: Fix assignment of const variable on declaration

We were previously assuming that we were reassigning a variable even
when we were not, oops, my bad. :/

1 files changed, 2 insertions, 2 deletions

diff --git a/Libraries/LibJS/Interpreter.cpp b/Libraries/LibJS/Interpreter.cpp
index 1f5c6d1e1c..5ca89f28f2 100644
--- a/Libraries/LibJS/Interpreter.cpp
+++ b/Libraries/LibJS/Interpreter.cpp
@@ -108,14 +108,14 @@ void Interpreter::declare_variable(String name, DeclarationType declaration_type
     }
 }
 
-void Interpreter::set_variable(String name, Value value)
+void Interpreter::set_variable(String name, Value value, bool first_assignment)
 {
     for (ssize_t i = m_scope_stack.size() - 1; i >= 0; --i) {
         auto& scope = m_scope_stack.at(i);
 
         auto possible_match = scope.variables.get(name);
         if (possible_match.has_value()) {
-            if (possible_match.value().declaration_type == DeclarationType::Const)
+            if (!first_assignment && possible_match.value().declaration_type == DeclarationType::Const)
                 ASSERT_NOT_REACHED();
 
             scope.variables.set(move(name), { move(value), possible_match.value().declaration_type });