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llvm-build (src/llvm/llvm-build/llvm-build) breaks with python3 [1].
I saw those errors during the LLVM build and figured it would be best to roll back to python2.
The carpet-bomb replacement might really be overkill, though -- the LLVM build takes a long time on my machine and I wanted to have rust working ASAP.
If the thing builds properly with python3 for everything except llvm-build, let me know (or I'll try that later myself).

[1]:
$ pwd
/home/mrshpot/build/rust-git/src/llvm/utils/llvm-build

$ python llvm-build
Traceback (most recent call last):
File "llvm-build", line 3, in <module>
import llvmbuild
File "/home/mrshpot/build/rust-git/src/llvm/utils/llvm-build/llvmbuild/__init__.py", line 1, in <module>
from main import main
ImportError: No module named main

$ python2 llvm-build
# runs with no errors

Are you sure you need to replace “python” with “python2”?

This page: https://github.com/graydon/rust/wiki/Doc-getting-started
suggests that Python 3 should be used.