--TEST--

See GitHub issue #4319 ( github.com/composer/composer/issues/4319 ).

Present a clear error message when config.platform.php version results in a conflict rule.

--CONDITION--
!defined('HHVM_VERSION')

--COMPOSER--
{
    "repositories": [
        {
            "type": "package",
            "package": [
                { "name": "a/a", "version": "1.0.0", "require": { "php": "5.5" } }
            ]
        }
    ],
    "require": {
        "a/a": "~1.0"
    },
    "config": {
        "platform": {
            "php": "5.3"
        }
    }
}

--RUN--
update

--EXPECT-OUTPUT--
Loading composer repositories with package information
Updating dependencies
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Root composer.json requires a/a ~1.0 -> satisfiable by a/a[1.0.0].
    - a/a 1.0.0 requires php 5.5 -> your php version (5.3; overridden via config.platform, actual: %s) does not satisfy that requirement.

--EXPECT--

--EXPECT-EXIT-CODE--
2