functions with bindings

vm/vm_test.go

@@ -379,6 +379,16 @@ func TestFirstClassFunctions(t *testing.T) {
         let returnsOne = fn() { 1; };
         let returnsOneReturner = fn() { returnsOne; };
         returnsOneReturner()();
+        `,
+			expected: 1,
+		},
+		{
+			input: `
+        let returnsOneReturner = fn() {
+            let returnsOne = fn() { 1; };
+            returnsOne;
+        };
+        returnsOneReturner()();
         `,
 			expected: 1,
 		},
@@ -386,3 +396,55 @@ func TestFirstClassFunctions(t *testing.T) {
 
 	runVmTests(t, tests)
 }
+
+func TestCallingFunctionsWithBindings(t *testing.T) {
+	tests := []vmTestCase{
+		{
+			input: `
+        let one = fn() { let one = 1; one };
+        one();
+        `,
+			expected: 1,
+		},
+		{
+			input: `
+        let oneAndTwo = fn() { let one = 1; let two = 2; one + two; };
+        oneAndTwo();
+        `,
+			expected: 3,
+		},
+		{
+			input: `
+        let oneAndTwo = fn() { let one = 1; let two = 2; one + two; };
+        let threeAndFour = fn() { let three = 3; let four = 4; three + four; };
+        oneAndTwo() + threeAndFour();
+        `,
+			expected: 10,
+		},
+		{
+			input: `
+        let firstFoobar = fn() { let foobar = 50; foobar; };
+        let secondFoobar = fn() { let foobar = 100; foobar; };
+        firstFoobar() + secondFoobar();
+        `,
+			expected: 150,
+		},
+		{
+			input: `
+        let globalSeed = 50;
+        let minusOne = fn() {
+            let num = 1;
+            globalSeed - num;
+        }
+        let minusTwo = fn() {
+            let num = 2;
+            globalSeed - num;
+        }
+        minusOne() + minusTwo();
+        `,
+			expected: 97,
+		},
+	}
+
+	runVmTests(t, tests)
+}