unqualified completions not working in NeoVim

Nobody has claimed this yet.

using neovim with LanguageClient, and for some reason autocompleting `Pervasives.int_of` works but simply `int_of` does not work.

LanguageClient is triggering `'textDocument/completion'` with characterposition
* 0 for "int_of"
* 11 for "Pervasives.int_of"

As far I've been able to tell a character offset of 0 would lead to `PartialParser.findCompletable` returning `Nothing`.

Shouldn't this complete modules and everything opened?

EDIT:
BuckleScript 7.1.1 ( Using OCaml:4.06.1+BS )

EDIT 2: log output that lead me to believe character 0 is the problem here
```
{"jsonrpc":"2.0","method":"textDocument/completion","params":{"position":{"character":0,"line":7},"textDocument":{"uri":"file:///home/hesxenon/projects/powermaze/src/App.re"}},"id":10}
[server] Got a method textDocument/completion
[server] processing took 0.0109672546387ms
Nothing completable found :/
Sending response {"id": 10, "jsonrpc": "2.0", "result": []}
```
vs
```
{"jsonrpc":"2.0","method":"textDocument/completion","params":{"position":{"character":5,"line":7},"textDocument":{"uri":"file:///home/hesxenon/projects/powermaze/src/App.re"}},"id":12}
[server] Got a method textDocument/completion
[server] processing took 0.00715255737305ms
Opens folkz > 0
Package opens Pervasives Powermaze Powermaze
Package opens Pervasives Powermaze Powermaze
FINDING docs for module Impl(/home/hesxenon/projects/powermaze/node_modules/bs-platform/lib/ocaml/pervasives.cmti, /home/hesxenon/projects/powermaze/node_modules/bs-platform/lib/ocaml/pervasives.mli)
FINDING /home/hesxenon/projects/powermaze/node_modules/bs-platform/lib/ocaml/pervasives.cmti src /home/hesxenon/projects/powermaze/node_modules/bs-platform/lib/ocaml/pervasives.mli
FINDING docs for module Impl(/home/hesxenon/projects/powermaze/lib/bs/Powermaze.cmt, nil)
FINDING /home/hesxenon/projects/powermaze/lib/bs/Powermaze.cmt src
FINDING docs for module Impl(/home/hesxenon/projects/powermaze/lib/bs/Powermaze.cmt, nil)
FINDING /home/hesxenon/projects/powermaze/lib/bs/Powermaze.cmt src
Opens nows 3 file:///home/hesxenon/projects/powermaze/node_modules/bs-platform/lib/ocaml/pervasives.mli file:///home/hesxenon/projects/powermaze/lib/bs/Powermaze.cmt file:///home/hesxenon/projects/powermaze/lib/bs/Powermaze.cmt
---------------- LOCAL VAL
- Completing in file:///home/hesxenon/projects/powermaze/node_modules/bs-platform/lib/ocaml/pervasives.mli
-- not capitalized
- Completing in file:///home/hesxenon/projects/powermaze/lib/bs/Powermaze.cmt
-- not capitalized
- Completing in file:///home/hesxenon/projects/powermaze/lib/bs/Powermaze.cmt
-- not capitalized
Sending response {"id": 12, "jsonrpc": "2.0", "result": [{"label": "int_of_float", "kind": 12, "detail": "float => int", "documentation": "Truncate the given floating-point number to an integer. The result is unspecified if the argument is `nan` or falls outside the range of representable integers.\n\n\n\nfile:///home/hesxenon/projects/powermaze/node_modules/bs-platform/lib/ocaml/pervasives.mli:612"}, {"label": "int_of_char", "kind": 12, "detail": "char => int", "documentation": "Return the ASCII code of the argument.\n\n\n\nfile:///home/hesxenon/projects/powermaze/node_modules/bs-platform/lib/ocaml/pervasives.mli:683"}, {"label": "int_of_string_opt", "kind": 12, "detail": "string => option(int)", "documentation": "Same as `int_of_string`, but returns `None` instead of raising.\n\nSince: 4.05\n\nfile:///home/hesxenon/projects/powermaze/node_modules/bs-platform/lib/ocaml/pervasives.mli:748"}, {"label": "int_of_string", "kind": 12, "detail": "string => int", "documentation": "Convert the given string to an integer. The string is read in decimal \\(by default, or if the string begins with `0u`\\), in hexadecimal \\(if it begins with `0x` or `0X`\\), in octal \\(if it begins with `0o` or `0O`\\), or in binary \\(if it begins with `0b` or `0B`\\).\n\nThe `0u` prefix reads the input as an unsigned integer in the range `[0, 2*max_int+1]`. If the input exceeds max_int it is converted to the signed integer `min_int + input - max_int - 1`.\n\nThe `_` \\(underscore\\) character can appear anywhere in the string and is ignored. Raise `Failure \"int_of_string\"` if the given string is not a valid representation of an integer, or if the integer represented exceeds the range of integers representable in type `int`.\n\n\n\nfile:///home/hesxenon/projects/powermaze/node_modules/bs-platform/lib/ocaml/pervasives.mli:729"}]}
```

Start at PartialParser.findCompletable and the textDocument/completion handling shown in the logs. Reproduce the difference between `int_of` and `Pervasives.int_of` in NeoVim with LanguageClient, then verify that unqualified completions include opened modules and other expected symbols.

Written by the indexing model from the issue text.