Installation problems: Source path "setup" is not found

[nuzil]

I'm follow installation instructions and got next problems:

During installation (composer install) got this error:

[RuntimeException]
  Source path "setup" is not found for package magento/setup

In composer.lock i see:

{
            "name": "magento/setup",
            "version": "dev-master",
            "dist": {
                "type": "path",
                "url": "setup",
                "reference": "7f956d8863423e052879f1b928de73780fd505c6",
                "shasum": null
            },
            "require": {
                "magento/library-console": "*",
                "php": "7.0.2|7.0.4|~7.0.6|~7.1.0"
            },
            "bin": [
                "magento"
            ],
            "type": "magento2-setup",
            "autoload": {
                "psr-4": {
                    "Magento\\Setup\\": ""
                }
            },
            "license": [
                "OSL-3.0",
                "AFL-3.0"
            ]
        },

What is "url": "setup", here? I dont get there it have to link to?

I tried to replace it with:
"url": "../source/magento2/setup/src/Magento/Setup",

But then I started to get this one:

Generating autoload files
    Skipped installation of bin magento for package magento/setup: file not found in package
magento root dir "root" missing! create now? [Y,n]

Will be happy to have a support here.

[nuzil]

@antonkril