Do not remove custom errors in IR pipeline when strip revert strings is requested

Author: matheusaaguiar

Changelog.md

@@ -13,6 +13,7 @@ Compiler Features:
 
 Bugfixes:
 * Yul EVM Code Transform: Improve stack shuffler performance by fixing a BFS deduplication issue.
+* Yul IR Code Generation: Preserve custom error argument of `require` when option `revert-strings=strip` is selected.
 
 
 ### 0.8.34 (2026-02-18)

libsolidity/codegen/ir/IRGeneratorForStatements.cpp

@@ -1158,10 +1158,7 @@ void IRGeneratorForStatements::endVisit(FunctionCall const& _functionCall)
 		solAssert(arguments.size() > 0, "Expected at least one parameter for require/assert");
 		solAssert(arguments.size() <= 2, "Expected no more than two parameters for require/assert");
 
-		Type const* messageArgumentType =
-			arguments.size() > 1 && m_context.revertStrings() != RevertStrings::Strip ?
-			arguments[1]->annotation().type :
-			nullptr;
+		Type const* messageArgumentType = arguments.size() > 1 ? arguments[1]->annotation().type : nullptr;
 
 		auto const* magicType = dynamic_cast<MagicType const*>(messageArgumentType);
 		if (magicType && magicType->kind() == MagicType::Kind::Error)
@@ -1175,6 +1172,9 @@ void IRGeneratorForStatements::endVisit(FunctionCall const& _functionCall)
 		}
 		else
 		{
+			// This option only remove strings, not custom errors
+			if (m_context.revertStrings() == RevertStrings::Strip)
+				messageArgumentType = nullptr;
 			ASTPointer<Expression const> stringArgumentExpression = messageArgumentType ? arguments[1] : nullptr;
 			std::string requireOrAssertFunction = m_utils.requireOrAssertFunction(
 				functionType->kind() == FunctionType::Kind::Assert,