chore: Add test for rangefunc (#117)

internal/testdata/snapshots/input/initial/go.mod

@@ -1,3 +1,3 @@
 module sg/initial
 
-go 1.19
+go 1.23

internal/testdata/snapshots/input/initial/rangefunc.go

@@ -0,0 +1,12 @@
+package initial
+
+import (
+  "slices"
+)
+
+func f(xs []int) int {
+  for _, x := range slices.All(xs) {
+    return x
+  }
+  return -1
+}

internal/testdata/snapshots/output/initial/rangefunc.go

@@ -0,0 +1,23 @@
+  package initial
+//        ^^^^^^^ reference 0.1.test `sg/initial`/
+
+  import (
+    "slices"
+//   ^^^^^^ reference github.com/golang/go/src go1.22 slices/
+  )
+
+  func f(xs []int) int {
+//     ^ definition 0.1.test `sg/initial`/f().
+//     documentation ```go
+//       ^^ definition local 0
+    for _, x := range slices.All(xs) {
+//         ^ definition local 1
+//                    ^^^^^^ reference github.com/golang/go/src go1.22 slices/
+//                           ^^^ reference github.com/golang/go/src go1.22 slices/All().
+//                               ^^ reference local 0
+      return x
+//           ^ reference local 1
+    }
+    return -1
+  }
+