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Add Windows proc-open errors to troubleshooting.md 

As per these issues:

https://github.com/composer/composer/issues/7186
https://github.com/composer/composer/issues/8152
pull/8390/head
John Stevenson 2019-10-08 14:46:37 +01:00 committed by Rob
parent 5687ac7de7
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@ -211,6 +211,19 @@ To enable the swap you can use for example:
```
You can make a permanent swap file following this [tutorial](https://www.digitalocean.com/community/tutorials/how-to-add-swap-on-ubuntu-14-04).
## proc_open(): failed to open stream errors (Windows)
If composer shows proc_open(NUL) errors on Windows:
`proc_open(NUL): failed to open stream: No such file or directory`
This could be happening because you are working in a _OneDrive_ directory and
using a version of PHP that does not support the file system semantics of this
service. The issue was fixed in PHP 7.2.23 and 7.3.10.
Alternatively it could be because the Windows Null Service is not enabled. For
more information, see this [issue](https://github.com/composer/composer/issues/7186#issuecomment-373134916).
## Degraded Mode
Due to some intermittent issues on Travis and other systems, we introduced a