Add tests

test/libsolidity/syntaxTests/dataLocations/externalFunction/function_argument_location_specifier_test_external_transient_storage.sol

@@ -0,0 +1,5 @@
+contract test {
+	function f(bytes transient) external;
+}
+// ----
+// TypeError 6651: (28-43): Data location must be "memory" or "calldata" for parameter in external function, but none was given.

test/libsolidity/syntaxTests/dataLocations/transient_state_variable.sol

@@ -0,0 +1,8 @@
+contract C {
+	uint transient x;
+	function f() public view returns(uint) {
+		return x;
+	}
+}
+// ----
+// TypeError 6651: (14-30): Data location can only be specified for array, struct or mapping types, but "transient" was given.

test/libsolidity/syntaxTests/variableDeclaration/transient_as_identifier.sol

@@ -0,0 +1,10 @@
+contract C {
+	function transient() public pure { }
+}
+contract D {
+	function f() public pure returns (uint) {
+		uint transient = 1;
+		return transient;
+	}
+}
+// ----

test/libsolidity/syntaxTests/variableDeclaration/transient_as_identifier_and_data_location.sol

@@ -0,0 +1,14 @@
+contract C {
+	function f() public pure returns (uint) {
+		uint transient = 1;
+		uint transient x = transient + 2;
+		return x;
+	}
+	function g() public pure returns (uint) {
+		uint transient transient = 9;
+		return transient;
+	}
+}
+// ----
+// TypeError 6651: (80-96): Data location can only be specified for array, struct or mapping types, but "transient" was given.
+// TypeError 6651: (174-198): Data location can only be specified for array, struct or mapping types, but "transient" was given.