Implemented else blocks

tests/errors/ExpectedIfBeforeElse.q

@@ -0,0 +1,3 @@
+main() {
+	else {}
+}

tests/errors/ExpectedIfBeforeElse2.q

@@ -0,0 +1,4 @@
+main() {
+	loop {}
+	else {}
+}

tests/errors_test.go

@@ -17,6 +17,8 @@ var errs = []struct {
 	{"ExpectedFunctionDefinition.q", errors.ExpectedFunctionDefinition},
 	{"ExpectedFunctionName.q", errors.ExpectedFunctionName},
 	{"ExpectedFunctionParameters.q", errors.ExpectedFunctionParameters},
+	{"ExpectedIfBeforeElse.q", errors.ExpectedIfBeforeElse},
+	{"ExpectedIfBeforeElse2.q", errors.ExpectedIfBeforeElse},
 	{"InvalidInstructionIdentifier.q", &errors.InvalidInstruction{Instruction: "abc"}},
 	{"InvalidInstructionNumber.q", &errors.InvalidInstruction{Instruction: "123"}},
 	{"InvalidInstructionExpression.q", &errors.InvalidInstruction{Instruction: "+"}},

tests/examples_test.go

@@ -16,8 +16,9 @@ var examples = []struct {
 	ExitCode int
 }{
 	{"hello", "", "Hello", 0},
-	{"factorial", "", "", 120},
-	{"fibonacci", "", "", 55},
+	{"factorial", "", "120", 0},
+	{"fibonacci", "", "55", 0},
+	{"gcd", "", "21", 0},
 	{"array", "", "Hello", 0},
 	{"echo", "Echo", "Echo", 0},
 	{"itoa", "", "9223372036854775807", 0},