Added complex case test for From derivation.

Issue Peternator7#33

strum_tests/tests/enum_discriminants.rs

@@ -163,3 +163,24 @@ fn from_ref_test() {
     assert_eq!(EnumIntoDiscriminants::A, (&EnumInto::A(true)).into());
     assert_eq!(EnumIntoDiscriminants::B, (&EnumInto::B(1)).into());
 }
+
+#[derive(Debug)]
+struct Rara;
+
+#[derive(Debug, Eq, PartialEq, EnumDiscriminants)]
+#[strum_discriminants(name(EnumIntoComplexVars),)]
+enum EnumIntoComplex<'a, T: 'a> {
+    A(&'a T),
+}
+
+#[test]
+fn from_test_complex() {
+    let rara = Rara;
+    assert_eq!(EnumIntoComplexVars::A, EnumIntoComplex::A(&rara).into());
+}
+
+#[test]
+fn from_ref_test_complex() {
+    let rara = Rara;
+    assert_eq!(EnumIntoComplexVars::A, (&EnumIntoComplex::A(&rara)).into());
+}