augmentedtypes & xhprof break composer

[bingalls]

I can install & run composer. However, after installing
php56-augmentedtypes
or
php56-xhprof

composer --version no longer outputs any value.
See also https://github.com/Homebrew/homebrew-php/issues/1424

Parameter	Value
OS X Version:	Yosemite 10.10
Homebrew Version:	0.9.5
PHP Version in use:	5.6.2
Xcode Version:	6.1
Output of gcc -v:	Configured with: --prefix=/Library/Developer/CommandLineTools/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
	Apple LLVM version 6.0 (clang-600.0.54) (based on LLVM 3.5svn) Target: x86_64-apple-darwin14.0.0 Thread model: posix
Output of php -v:	PHP 5.6.2 (cli) (built: Nov 7 2014 16:32:39)
	Copyright (c) 1997-2014 The PHP Group Zend Engine v2.6.0, Copyright (c) 1998-2014 Zend Technologies with Xdebug v2.2.5, Copyright (c) 2002-2014, by Derick Rethans
Output of brew doctor (within a gist)	Your system is ready to brew.
Output of composer --version	Composer version 1.0.0-alpha8 2014-01-06 18:39:59