I wanted to install plugins on a slightly older machine with Git 1.7.7 and Vim 7.3 (+ruby). For some reason, vim-plug tries to clone URLs like https://git:@github.com/Shougo/neosnippet.git. This looks to me like trying to clone with user "git:" but you seem to have a reason to construct the URL like that. Anyway, that breaks for me because I cannot type in passwords and Vim gets locked up.
P.S.: Replacing that URI with plain 'https://github.com/' ... solves the problem.
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