Can't open tempfile: no such file or directory

[R3load]

When trying to run a range with :'<,'>QuickRun:

/usr/bin/python: can't open file '/home/rld/local/tmp/nvim7Nlk4L/5': [Errno 2] No such file or directory

Problem persists after changing $TMPDIR to ~/local/tmp (seen above), no difference from using an empty $TMPDIR (falls back to /tmp/nvimXXXXXX/).

• Using default tempfile.
• :echo tempname() prints the right dir
• ownership is correct, permissions are 0700