Exception `Start and End must be well ordered`

[microsoft]

Exception `Start and End must be well ordered`

[jakebailey]

I can reproduce this. Minimal example:

import sys

sys version

Type a . after sys. CompletionAnalysis.Node isn't sys like it should be, but is instead version. This makes span.End > trigger, and then it tries to make the result have a span of new SourceSpan(span.Start, trigger), except that the trigger character is before the node that the completion analysis thinks it needs to process.

[qubitron]

I get this issue in django app from here: https://github.com/Microsoft/python-sample-vs-learning-django

It's intermittent though, here's DjangoPolls/app/models.py:

[MikhailArkhipov]

Can't repro :-(

[MikhailArkhipov]

Will reactivate if it happens again

[qubitron]

I am seeing this with latest version

[Error - 9:28:39 AM] Request textDocument/completion failed.
  Message: Start and End must be well ordered
  Code: -32000 
[object Object]

When typing models. on line 5 of:
https://github.com/Microsoft/python-sample-vscode-django-tutorial/blob/master/hello/models.py

[qubitron]

Call stack:

[Error - 12:02:22 PM] System.ArgumentException: Start and End must be well ordered
   at Microsoft.PythonTools.SourceSpan.ValidateLocations(SourceLocation start, SourceLocation end) in C:\Users\jabaile\python-language-server\src\Analysis\Engine\Impl\Infrastructure\SourceSpan.cs:line 51
   at Microsoft.PythonTools.SourceSpan..ctor(SourceLocation start, SourceLocation end) in C:\Users\jabaile\python-language-server\src\Analysis\Engine\Impl\Infrastructure\SourceSpan.cs:line 36
   at Microsoft.Python.LanguageServer.Implementation.Server.Completion(CompletionParams params, CancellationToken cancellationToken) in C:\Users\jabaile\python-language-server\src\LanguageServer\Impl\Implementation\Server.Completion.cs:line 80
   at Microsoft.Python.LanguageServer.Implementation.LanguageServer.<>c__DisplayClass39_0.<<Completion>b__0>d.MoveNext() in C:\Users\jabaile\python-language-server\src\LanguageServer\Impl\LanguageServer.cs:line 289
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.Python.LanguageServer.Implementation.LanguageServer.LogOnException[TResult](Func`1 func) in C:\Users\jabaile\python-language-server\src\LanguageServer\Impl\LanguageServer.cs:line 476
[Error - 12:02:22 PM] Request textDocument/completion failed.
  Message: Start and End must be well ordered
  Code: -32000