Added regression function match value test

[XAMPPRocky]

closes #44333

[pietroalbini]

Highfive didn't assign a reviewer, assigning @oli-obk since they requested the test.

[oli-obk]

@bors r+ rollup

[bors]

📌 Commit a6476a7 has been approved by oli-obk

[rust-highfive]

The job x86_64-gnu-llvm-3.9 of your PR failed on Travis (raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.

/usr/local/lib/python2.7/dist-packages/pip/_vendor/requests/packages/urllib3/util/ssl_.py:122: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. You can upgrade to a newer version of Python to solve this. For more information, see https://urllib3.readthedocs.io/en/latest/security.html#insecureplatformwarning.
  InsecurePlatformWarning
/usr/local/lib/python2.7/dist-packages/pip/_vendor/requests/packages/urllib3/util/ssl_.py:122: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. You can upgrade to a newer version of Python to solve this. For more information, see https://urllib3.readthedocs.io/en/latest/security.html#insecureplatformwarning.
  InsecurePlatformWarning
  Retrying (Retry(total=4, connect=None, read=None, redirect=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7fd3db886990>, 'Connection to files.pythonhosted.org timed out. (connect timeout=15)')': /packages/e8/d7/9a01c1e73cfceedacef3f8837797fe5a8d93f2b3d7c6129622d0bf7658ad/awscli-1.15.14-py2.py3-none-any.whl
  Retrying (Retry(total=3, connect=None, read=None, redirect=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7fd3db886e10>, 'Connection to files.pythonhosted.org timed out. (connect timeout=15)')': /packages/e8/d7/9a01c1e73cfceedacef3f8837797fe5a8d93f2b3d7c6129622d0bf7658ad/awscli-1.15.14-py2.py3-none-any.whl
  Retrying (Retry(total=2, connect=None, read=None, redirect=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7fd3dafd7090>, 'Connection to files.pythonhosted.org timed out. (connect timeout=15)')': /packages/e8/d7/9a01c1e73cfceedacef3f8837797fe5a8d93f2b3d7c6129622d0bf7658ad/awscli-1.15.14-py2.py3-none-any.whl
  Retrying (Retry(total=1, connect=None, read=None, redirect=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7fd3dafd71d0>, 'Connection to files.pythonhosted.org timed out. (connect timeout=15)')': /packages/e8/d7/9a01c1e73cfceedacef3f8837797fe5a8d93f2b3d7c6129622d0bf7658ad/awscli-1.15.14-py2.py3-none-any.whl
  Retrying (Retry(total=0, connect=None, read=None, redirect=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7fd3dafd7310>, 'Connection to files.pythonhosted.org timed out. (connect timeout=15)')': /packages/e8/d7/9a01c1e73cfceedacef3f8837797fe5a8d93f2b3d7c6129622d0bf7658ad/awscli-1.15.14-py2.py3-none-any.whl
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/pip/basecommand.py", line 215, in main
    status = self.run(options, args)
  File "/usr/local/lib/python2.7/dist-packages/pip/commands/install.py", line 335, in run
---
    r = adapter.send(request, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/pip/_vendor/cachecontrol/adapter.py", line 47, in send
    resp = super(CacheControlAdapter, self).send(request, **kw)
  File "/usr/local/lib/python2.7/dist-packages/pip/_vendor/requests/adapters.py", line 479, in send
    raise ConnectTimeout(e, request=request)
ConnectTimeout: HTTPSConnectionPool(host='files.pythonhosted.org', port=443): Max retries exceeded with url: /packages/e8/d7/9a01c1e73cfceedacef3f8837797fe5a8d93f2b3d7c6129622d0bf7658ad/awscli-1.15.14-py2.py3-none-any.whl (Caused by ConnectTimeoutError(<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7fd3dafd7410>, 'Connection to files.pythonhosted.org timed out. (connect timeout=15)'))
  InsecurePlatformWarning
/usr/local/lib/python2.7/dist-packages/pip/_vendor/requests/packages/urllib3/util/ssl_.py:122: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. You can upgrade to a newer version of Python to solve this. For more information, see https://urllib3.readthedocs.io/en/latest/security.html#insecureplatformwarning.
  InsecurePlatformWarning
You are using pip version 9.0.1, however version 10.0.1 is available.
---

[00:04:54] travis_fold:start:tidy
travis_time:start:tidy
tidy check
[00:04:54] tidy error: /checkout/src/test/run-pass/issue-44333.rs: incorrect license
[00:04:56] some tidy checks failed
[00:04:56] 
[00:04:56] 
[00:04:56] command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-tools-bin/tidy" "/checkout/src" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/cargo" "--no-vendor" "--quiet"
[00:04:56] 
[00:04:56] 
[00:04:56] failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test src/tools/tidy
[00:04:56] Build completed unsuccessfully in 0:01:59
[00:04:56] Build completed unsuccessfully in 0:01:59
[00:04:56] Makefile:79: recipe for target 'tidy' failed
[00:04:56] make: *** [tidy] Error 1

The command "stamp sh -x -c "$RUN_SCRIPT"" exited with 2.
travis_time:start:293fffb4
$ date && (curl -fs --head https://google.com | grep ^Date: | sed 's/Date: //g' || true)

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN. (Feature Requests)

[oli-obk]

@bors r-

Please prepend the test with the correct license. You can just copy it out of any other test.

[XAMPPRocky]

@oli-obk Whoops, added now.

[oli-obk]

@bors r+ rollup

[bors]

📌 Commit 31a8ffe has been approved by oli-obk