$OpenBSD$

Backport https://github.com/ethereum/solidity/commit/1d3a37faff9a82a5269c3414a2d6fe868593afb1

Index: libsolidity/inlineasm/AsmParser.cpp
--- libsolidity/inlineasm/AsmParser.cpp.orig
+++ libsolidity/inlineasm/AsmParser.cpp
@@ -606,7 +606,9 @@ bool Parser::isValidNumberLiteral(string const& _liter
 {
 	try
 	{
-		u256(_literal);
+		// Try to convert _literal to u256.
+		auto tmp = u256(_literal);
+		(void) tmp;
 	}
 	catch (...)
 	{
