repl: Mitigate vm #548 function redefinition issue

```js
node 🙈 ₹ git:(upstream ⚡ repl-tmp-548) ./node
> function name() { return "node"; };
undefined
> name()
'node'
> function name() { return "nodejs"; };
undefined
> name()
'nodejs'
>
```

Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Lance Ball <lball@redhat.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/test/known_issues/test-repl-function-redefinition-edge-case.js b/test/known_issues/test-repl-function-redefinition-edge-case.js
new file mode 100644
index 0000000000..03b721fba7
--- /dev/null
+++ b/test/known_issues/test-repl-function-redefinition-edge-case.js
@@ -0,0 +1,38 @@
+// Reference: https://github.com/nodejs/node/pull/7624
+'use strict';
+const common = require('../common');
+const assert = require('assert');
+const repl = require('repl');
+const stream = require('stream');
+
+common.globalCheck = false;
+
+const r = initRepl();
+
+r.input.emit('data', 'function a() { return 42; } (1)\n');
+r.input.emit('data', 'a\n');
+r.input.emit('data', '.exit');
+
+const expected = '1\n[Function a]\n';
+const got = r.output.accumulator.join('');
+assert.strictEqual(got, expected);
+
+function initRepl() {
+  const input = new stream();
+  input.write = input.pause = input.resume = () => {};
+  input.readable = true;
+
+  const output = new stream();
+  output.writable = true;
+  output.accumulator = [];
+
+  output.write = (data) => output.accumulator.push(data);
+
+  return repl.start({
+    input,
+    output,
+    useColors: false,
+    terminal: false,
+    prompt: ''
+  });
+}