Merge pull request #2504 from ethereum/inlineasm-decl-empty

Support variable declarations without an assignment in assembly

test/libjulia/Parser.cpp

@@ -131,6 +131,11 @@ BOOST_AUTO_TEST_CASE(vardecl_bool)
 	BOOST_CHECK(successParse("{ let x:bool := false:bool }"));
 }
 
+BOOST_AUTO_TEST_CASE(vardecl_empty)
+{
+	BOOST_CHECK(successParse("{ let x:u256 }"));
+}
+
 BOOST_AUTO_TEST_CASE(assignment)
 {
 	BOOST_CHECK(successParse("{ let x:u256 := 2:u256 let y:u256 := x }"));

test/libsolidity/InlineAssembly.cpp

@@ -195,6 +195,11 @@ BOOST_AUTO_TEST_CASE(vardecl_bool)
 	CHECK_PARSE_ERROR("{ let x := false }", ParserError, "True and false are not valid literals.");
 }
 
+BOOST_AUTO_TEST_CASE(vardecl_empty)
+{
+	BOOST_CHECK(successParse("{ let x }"));
+}
+
 BOOST_AUTO_TEST_CASE(assignment)
 {
 	BOOST_CHECK(successParse("{ let x := 2 7 8 add =: x }"));

test/libsolidity/SolidityEndToEndTest.cpp

@@ -9723,6 +9723,24 @@ BOOST_AUTO_TEST_CASE(multi_modifiers)
 	BOOST_CHECK(callContractFunction("x()") == encodeArgs(u256(12)));
 }
 
+BOOST_AUTO_TEST_CASE(inlineasm_empty_let)
+{
+	char const* sourceCode = R"(
+		contract C {
+			function f() returns (uint a, uint b) {
+				assembly {
+					let x
+					let y, z
+					a := x
+					b := z
+				}
+			}
+		}
+	)";
+	compileAndRun(sourceCode, 0, "C");
+	BOOST_CHECK(callContractFunction("f()") == encodeArgs(u256(0), u256(0)));
+}
+
 BOOST_AUTO_TEST_SUITE_END()
 
 }