#load in an fsx script breaks FlyCheck and auto-completion

### Description

When I add a `#load` directive in order to reference an .fs file from an .fsx script file, it appears that communication with the fsautocomplete process stalls. This happens with the simplest possible files I can make, and reliably happens upon completing the line.

### Repro steps

1. Create 'Simple.fs' as
```fsharp
module Simple

let times2 x = x * 2
```
2. Create 'test.fsx' as
```fsharp
let y = 2
```
Observe that type hints show in the minibuffer and help is available. Completion and tooltips appear if you continue adding to the file.
3. Add a line to 'test.fsx': `#load "./Simple.fs"`
4. Upon completing the line in (3), the FlyCheck modeline indicator gains an asterisk, indicating it is active

There's no big CPU or RAM consumption. Leaving it for up to 10 minutes does nothing. All FSAC functionality is gone.

### Expected behavior

At the very least, I should still get FSAC functionality within the .fsx file.

Ideally, we'd get FSAC functionality for the functions in the .fs file.

### Actual behavior

Hanging FlyCheck and broken intellisense.

### Known workarounds

Don't use `#load` directives in .fsx scripts.

### Related information

Running on WSL v1, Ubuntu 18.04

I have below:
- A debug log with `(setq fsharp-ac-debug 20)`
- Output of `report-emacs-bug`
- Output of `$ mono --version`
- Output of `$ dotnet --info` (though I don't use this for emacs development)

**FSAC debug log**

> 06:38:28.084582 (fsharp-ac-parse-current-buffer): Parsing "/mnt/c/Users/g/OneDrive/code/antifound.com/test2.fsx"
06:38:28.186749 (fsharp-ac-send-pos-request): typesig "/mnt/c/Users/g/OneDrive/code/antifound.com/test2.fsx" "let x = 2" 1 1 400
06:38:28.188132 (fsharp-ac-send-pos-request): symboluse "/mnt/c/Users/g/OneDrive/code/antifound.com/test2.fsx" "let x = 2" 1 1 400
06:38:31.039346 (fsharp-ac--get-msg): {"Kind":"info","Data":"Background parsing started"}
06:38:31.039437 (fsharp-ac-filter-output): Received ’info’ message of length 2
06:38:31.039465 (fsharp-ac--get-msg): {"Kind":"errors","Data":{"File":"/mnt/c/Users/g/OneDrive/code/antifound.com/test2.fsx","Errors":[]}}
06:38:31.039533 (fsharp-ac-filter-output): Received ’errors’ message of length 2
06:38:31.041385 (fsharp-ac-send-pos-request): lint "/mnt/c/Users/g/OneDrive/code/antifound.com/test2.fsx" "let x = 2" 1 1 400
06:38:31.385100 (fsharp-ac--get-msg): {"Kind":"typesig","Data":"let"}
06:38:31.385167 (fsharp-ac-filter-output): Received ’typesig’ message of length 2
06:38:31.412734 (fsharp-ac--get-msg): {"Kind":"info","Data":"No symbol information found"}
06:38:31.412858 (fsharp-ac-filter-output): Received ’info’ message of length 2
06:38:31.822889 (fsharp-ac--get-msg): {"Kind":"lint","Data":[]}
06:38:31.823048 (fsharp-ac-filter-output): Received ’lint’ message of length 2
06:38:33.663749 (fsharp-ac-parse-current-buffer): Parsing "/mnt/c/Users/g/OneDrive/code/antifound.com/test2.fsx"
06:38:33.702962 (fsharp-ac--get-msg): {"Kind":"info","Data":"Background parsing started"}
06:38:33.703044 (fsharp-ac-filter-output): Received ’info’ message of length 2
06:38:33.703068 (fsharp-ac--get-msg): {"Kind":"errors","Data":{"File":"/mnt/c/Users/g/OneDrive/code/antifound.com/test2.fsx","Errors":[]}}
06:38:33.703137 (fsharp-ac-filter-output): Received ’errors’ message of length 2
06:38:33.704817 (fsharp-ac-send-pos-request): lint "/mnt/c/Users/g/OneDrive/code/antifound.com/test2.fsx" "" 1 1 400
06:38:33.708815 (fsharp-ac--get-msg): {"Kind":"lint","Data":[]}
06:38:33.708908 (fsharp-ac-filter-output): Received ’lint’ message of length 2
06:38:34.840693 (fsharp-ac-send-pos-request): typesig "/mnt/c/Users/g/OneDrive/code/antifound.com/test2.fsx" "#" 1 2 400
06:38:34.842295 (fsharp-ac-send-pos-request): symboluse "/mnt/c/Users/g/OneDrive/code/antifound.com/test2.fsx" "#" 1 2 400
06:38:34.845597 (fsharp-ac--get-msg): {"Kind":"info","Data":"Cannot find ident for tooltip"}
06:38:34.845719 (fsharp-ac-filter-output): Received ’info’ message of length 2
06:38:34.857528 (fsharp-ac--get-msg): {"Kind":"info","Data":"No ident at this location"}
06:38:34.857601 (fsharp-ac-filter-output): Received ’info’ message of length 2
06:38:34.961887 (fsharp-ac-parse-current-buffer): Parsing "/mnt/c/Users/g/OneDrive/code/antifound.com/test2.fsx"
06:38:34.962797 (fsharp-ac-send-pos-request): completion "/mnt/c/Users/g/OneDrive/code/antifound.com/test2.fsx" "#l" 1 3 400 filter=StartsWith
06:38:35.006898 (fsharp-ac--get-msg): {"Kind":"info","Data":"Background parsing started"}
06:38:35.006989 (fsharp-ac-filter-output): Received ’info’ message of length 2
06:38:35.007013 (fsharp-ac--get-msg): {"Kind":"errors","Data":{"File":"/mnt/c/Users/g/OneDrive/code/antifound.com/test2.fsx","Errors":[]}}
06:38:35.007078 (fsharp-ac-filter-output): Received ’errors’ message of length 2
06:38:35.076259 (fsharp-ac--get-msg): {"Kind":"completion","Data":[]}
06:38:35.076328 (fsharp-ac-filter-output): Received ’completion’ message of length 2
06:38:35.141957 (fsharp-ac-send-pos-request): completion "/mnt/c/Users/g/OneDrive/code/antifound.com/test2.fsx" "#lo" 1 4 400 filter=StartsWith
06:38:35.144461 (fsharp-ac--get-msg): {"Kind":"completion","Data":[]}
06:38:35.144525 (fsharp-ac-filter-output): Received ’completion’ message of length 2
06:38:35.231184 (fsharp-ac-send-pos-request): typesig "/mnt/c/Users/g/OneDrive/code/antifound.com/test2.fsx" "#lo" 1 4 400
06:38:35.232580 (fsharp-ac-send-pos-request): symboluse "/mnt/c/Users/g/OneDrive/code/antifound.com/test2.fsx" "#lo" 1 4 400
06:38:35.235396 (fsharp-ac--get-msg): {"Kind":"info","Data":"Cannot find ident for tooltip"}
06:38:35.235579 (fsharp-ac-filter-output): Received ’info’ message of length 2
06:38:35.238238 (fsharp-ac--get-msg): {"Kind":"info","Data":"No ident at this location"}
06:38:35.238327 (fsharp-ac-filter-output): Received ’info’ message of length 2
06:38:35.249234 (fsharp-ac-send-pos-request): completion "/mnt/c/Users/g/OneDrive/code/antifound.com/test2.fsx" "#loa" 1 5 400 filter=StartsWith
06:38:35.251938 (fsharp-ac--get-msg): {"Kind":"completion","Data":[]}
06:38:35.252020 (fsharp-ac-filter-output): Received ’completion’ message of length 2
06:38:35.338925 (fsharp-ac-send-pos-request): typesig "/mnt/c/Users/g/OneDrive/code/antifound.com/test2.fsx" "#loa" 1 5 400
06:38:35.340748 (fsharp-ac-send-pos-request): symboluse "/mnt/c/Users/g/OneDrive/code/antifound.com/test2.fsx" "#loa" 1 5 400
06:38:35.343140 (fsharp-ac--get-msg): {"Kind":"info","Data":"Cannot find ident for tooltip"}
06:38:35.343212 (fsharp-ac-filter-output): Received ’info’ message of length 2
06:38:35.356092 (fsharp-ac--get-msg): {"Kind":"info","Data":"No ident at this location"}
06:38:35.356188 (fsharp-ac-filter-output): Received ’info’ message of length 2
06:38:35.406385 (fsharp-ac-send-pos-request): completion "/mnt/c/Users/g/OneDrive/code/antifound.com/test2.fsx" "#load" 1 6 400 filter=StartsWith
06:38:35.408671 (fsharp-ac--get-msg): {"Kind":"completion","Data":[]}
06:38:35.408738 (fsharp-ac-filter-output): Received ’completion’ message of length 2
06:38:35.496985 (fsharp-ac-send-pos-request): typesig "/mnt/c/Users/g/OneDrive/code/antifound.com/test2.fsx" "#load" 1 6 400
06:38:35.498416 (fsharp-ac-send-pos-request): symboluse "/mnt/c/Users/g/OneDrive/code/antifound.com/test2.fsx" "#load" 1 6 400
06:38:35.500435 (fsharp-ac--get-msg): {"Kind":"info","Data":"Cannot find ident for tooltip"}
06:38:35.500527 (fsharp-ac-filter-output): Received ’info’ message of length 2
06:38:35.521382 (fsharp-ac--get-msg): {"Kind":"info","Data":"No ident at this location"}
06:38:35.521471 (fsharp-ac-filter-output): Received ’info’ message of length 2
06:38:35.896975 (fsharp-ac-parse-current-buffer): Parsing "/mnt/c/Users/g/OneDrive/code/antifound.com/test2.fsx"
06:38:36.030698 (fsharp-ac--get-msg): {"Kind":"info","Data":"Background parsing started"}
06:38:36.030833 (fsharp-ac-filter-output): Received ’info’ message of length 2
06:38:36.030918 (fsharp-ac--get-msg): {"Kind":"errors","Data":{"File":"/mnt/c/Users/g/OneDrive/code/antifound.com/test2.fsx","Errors":[{"FileName":"/mnt/c/Users/g/OneDrive/code/antifound.com/test2.fsx","StartLine":1,"EndLine":2,"StartColumn":1,"EndColumn":1,"Severity":"Error","Message":"Invalid directive. Expected '#load \"\" ... \"\"'.","Subcategory":"parse"},{"FileName":"/mnt/c/Users/g/OneDrive/code/antifound.com/test2.fsx","StartLine":1,"EndLine":2,"StartColumn":1,"EndColumn":1,"Severity":"Error","Message":"Invalid directive. Expected '#load \"\" ... \"\"'.","Subcategory":"parse"}]}}
06:38:36.031822 (fsharp-ac-filter-output): Received ’errors’ message of length 2
06:38:42.054124 (fsharp-ac-parse-current-buffer): Parsing "/mnt/c/Users/g/OneDrive/code/antifound.com/test2.fsx"
06:38:42.291198 (fsharp-ac--get-msg): {"Kind":"info","Data":"Background parsing started"}
06:38:42.291321 (fsharp-ac-filter-output): Received ’info’ message of length 2
06:38:42.291346 (fsharp-ac--get-msg): {"Kind":"errors","Data":{"File":"/mnt/c/Users/g/OneDrive/code/antifound.com/test2.fsx","Errors":[]}}
06:38:42.291439 (fsharp-ac-filter-output): Received ’errors’ message of length 2
06:38:42.293685 (fsharp-ac-send-pos-request): lint "/mnt/c/Users/g/OneDrive/code/antifound.com/test2.fsx" "#load \"./Simple.fs\"" 1 20 400
06:38:42.295485 (fsharp-ac--get-msg): {"Kind":"info","Data":"Cached typecheck results not yet available"}
06:38:42.295555 (fsharp-ac-filter-output): Received ’info’ message of length 2

**report-emacs-bug**

> In GNU Emacs 25.2.2 (x86_64-pc-linux-gnu, GTK+ Version 3.22.21)
of 2017-09-22, modified by Debian built on lgw01-amd64-050
Windowing system distributor 'HC-Consult', version 11.0.12005001
System Description: Ubuntu 18.04.3 LTS

> Configured using:
'configure --build x86_64-linux-gnu --prefix=/usr
--sharedstatedir=/var/lib --libexecdir=/usr/lib
--localstatedir=/var/lib --infodir=/usr/share/info
--mandir=/usr/share/man --with-pop=yes
--enable-locallisppath=/etc/emacs25:/etc/emacs:/usr/local/share/emacs/25.2/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/25.2/site-lisp:/usr/share/emacs/site-lisp
--with-sound=alsa --without-gconf --build x86_64-linux-gnu
--prefix=/usr --sharedstatedir=/var/lib --libexecdir=/usr/lib
--localstatedir=/var/lib --infodir=/usr/share/info
--mandir=/usr/share/man --with-pop=yes
--enable-locallisppath=/etc/emacs25:/etc/emacs:/usr/local/share/emacs/25.2/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/25.2/site-lisp:/usr/share/emacs/site-lisp
--with-sound=alsa --without-gconf --with-x=yes --with-x-toolkit=gtk3
--with-toolkit-scroll-bars 'CFLAGS=-g -O2
-fdebug-prefix-map=/build/emacs25-jYekUr/emacs25-25.2+1=. -fstack-protector-strong
-Wformat -Werror=format-security -Wall' 'CPPFLAGS=-Wdate-time
-D_FORTIFY_SOURCE=2' 'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro''

> Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS NOTIFY
ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11

> Important settings:
value of $LANG: C.UTF-8
locale-coding-system: utf-8-unix

> Major mode: Lisp Interaction

> Minor modes in effect:
elisp-slime-nav-mode: t
global-company-mode: t
company-mode: t
global-magit-file-mode: t
diff-auto-refine-mode: t
magit-auto-revert-mode: t
global-git-commit-mode: t
async-bytecomp-package-mode: t
ido-everywhere: t
evil-leader-mode: t
global-undo-tree-mode: t
undo-tree-mode: t
shell-dirtrack-mode: t
evil-mode: t
evil-local-mode: t
override-global-mode: t
tooltip-mode: t
global-eldoc-mode: t
eldoc-mode: t
electric-indent-mode: t
mouse-wheel-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
font-lock-mode: t
auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t
line-number-mode: t
transient-mark-mode: t

> Recent messages:
, r is undefined
let
Auto-saving...done
Mark set
Replaced 29 occurrences [2 times]
Mark set
Making completion list... [2 times]

> Load-path shadows:
/usr/share/emacs/25.2/site-lisp/debian-startup hides /usr/share/emacs/site-lisp/debian-startup
/home/ggb/.emacs.d/elpa/seq-2.20/seq hides /usr/share/emacs/25.2/lisp/emacs-lisp/seq

> Features:
(shadow sort mail-extr emacsbug sendmail vc-git company-quickhelp
pos-tip fsharp-mode-font fsharp-mode-indent info-look markdown-mode
url-parse url-vars fsharp-mode fsharp-mode-indent-smie smie
inf-fsharp-mode fsharp-doc flycheck-fsharp flycheck find-func
fsharp-mode-completion rx fsharp-mode-util elpy find-file-in-project ivy
delsel colir color ivy-overlay elpy-rpc pyvenv esh-var esh-io esh-cmd
esh-opt esh-ext esh-proc esh-arg esh-groups eshell esh-module esh-mode
esh-util elpy-shell elpy-profile elpy-django s elpy-refactor python
tramp-sh tramp tramp-compat auth-source tramp-loaddefs trampver
ucs-normalize json map grep files-x cus-edit cus-start cus-load wid-edit
ac-geiser geiser paredit elisp-slime-nav slime-fancy slime-trace-dialog
slime-fontifying-fu slime-package-fu slime-references
slime-compiler-notes-tree slime-scratch slime-presentations bridge
slime-macrostep macrostep slime-mdot-fu slime-enclosing-context
slime-fuzzy slime-fancy-trace slime-fancy-inspector slime-c-p-c
slime-editing-commands slime-autodoc slime-repl elp slime-parse slime
derived lisp-mnt gud apropos compile arc-mode archive-mode noutline
outline pp hyperspec browse-url cl slime-autoloads company-oddmuse
company-keywords company-etags etags xref project company-gtags
company-dabbrev-code company-dabbrev company-files company-capf
company-cmake company-xcode company-clang company-semantic company-eclim
company-template company-css company-nxml company-bbdb company
auto-complete popup evil-magit magit-submodule magit-obsolete
magit-blame magit-stash magit-reflog magit-bisect magit-push magit-pull
magit-fetch magit-clone magit-remote magit-commit magit-sequence
magit-notes magit-worktree magit-tag magit-merge magit-branch
magit-reset magit-files magit-refs magit-status magit magit-repos
magit-apply magit-wip magit-log which-func imenu magit-diff smerge-mode
diff-mode magit-core magit-autorevert autorevert filenotify magit-margin
magit-transient magit-process magit-mode transient git-commit magit-git
magit-section eieio eieio-core magit-utils crm log-edit message dired
format-spec rfc822 mml mml-sec password-cache epg gnus-util time-date
mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045
ietf-drums mm-util help-fns mail-prsvr mailabbrev mail-utils gmm-utils
mailheader pcvs-util add-log with-editor async-bytecomp async server
dash ace-window subr-x avy yasnippet ido key-chord evil-leader evil
evil-keybindings evil-integration undo-tree diff evil-maps evil-commands
reveal flyspell ispell evil-jumps evil-command-window evil-types
evil-search evil-ex shell pcomplete comint ansi-color evil-macros
evil-repeat evil-states evil-core advice evil-common windmove thingatpt
rect evil-digraphs evil-vars ring edmacro kmacro cl-macs cl-seq
use-package use-package-ensure use-package-delight use-package-diminish
use-package-bind-key bind-key easy-mmode use-package-core finder-inf
info parse-time package epg-config seq byte-opt gv bytecomp byte-compile
cl-extra help-mode easymenu cconv cl-loaddefs pcase cl-lib mule-util
tooltip eldoc electric uniquify ediff-hook vc-hooks lisp-float-type
mwheel x-win term/common-win x-dnd tool-bar dnd fontset image regexp-opt
fringe tabulated-list newcomment elisp-mode lisp-mode prog-mode register
page menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock
font-lock syntax facemenu font-core frame cl-generic cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese eucjp-ms cp51932 hebrew greek romanian slovak czech european
ethiopic indian cyrillic chinese charscript case-table epa-hook
jka-cmpr-hook help simple abbrev minibuffer cl-preloaded nadvice
loaddefs button faces cus-face macroexp files text-properties overlay
sha1 md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote dbusbind inotify dynamic-setting
system-font-setting font-render-setting move-toolbar gtk x-toolkit x
multi-tty make-network-process emacs)

> Memory information:
((conses 16 636156 61783)
(symbols 48 51232 0)
(miscs 40 122 683)
(strings 32 143710 18327)
(string-bytes 1 4129390)
(vectors 16 73177)
(vector-slots 8 1116938 19206)
(floats 8 783 273)
(intervals 56 1623 358)
(buffers 976 27))

**Mono version**
```
Mono JIT compiler version 6.0.0.334 (tarball Thu Sep 12 21:34:14 UTC 2019) Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com
TLS: __thread
SIGSEGV: altstack
Notifications: epoll
Architecture: amd64
Disabled: none
Misc: softdebug
Interpreter: yes
LLVM: yes(600)
Suspend: hybrid
GC: sgen (concurrent by default)
```

**dotnet core version**
```
.NET Core SDK (reflecting any global.json):
Version: 3.0.100
Commit: 04339c3a26

Runtime Environment:
OS Name: ubuntu
OS Version: 18.04
OS Platform: Linux
RID: ubuntu.18.04-x64
Base Path: /usr/share/dotnet/sdk/3.0.100/

Host (useful for support):
Version: 3.0.0
Commit: 95a0a61858

.NET Core SDKs installed:
3.0.100 [/usr/share/dotnet/sdk]

.NET Core runtimes installed:
Microsoft.AspNetCore.App 3.0.0 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 3.0.0 [/usr/share/dotnet/shared/Microsoft.NETCore.App]
```