Merge pull request ethereum#15335 from lmanini/patch-2

Typo in ContractCompiler.cpp

Author: ekpyron

libsolidity/codegen/ContractCompiler.cpp

@@ -1396,7 +1396,7 @@ bool ContractCompiler::visit(PlaceholderStatement const& _placeholderStatement)
 {
 	StackHeightChecker checker(m_context);
 	CompilerContext::LocationSetter locationSetter(m_context, _placeholderStatement);
-	solAssert(m_context.arithmetic() == Arithmetic::Checked, "Placeholder cannot be used inside checked block.");
+	solAssert(m_context.arithmetic() == Arithmetic::Checked, "Placeholder cannot be used inside unchecked block.");
 	appendModifierOrFunctionCode();
 	solAssert(m_context.arithmetic() == Arithmetic::Checked, "Arithmetic not reset to 'checked'.");
 	checker.check();