vim-go and rust.vim not work normally during gvim GUI session in Arch

[rustyhu]

Example:
vim-go can not find correct $GOPATH under Arch when $GOPATH was set /opt/go.
rust.vim can not find rustfmt command, which is under /opt/rust/.cargo/bin

Consider moving them back, under default .vim path.

[rustyhu]

After tests and observation, some subcmds of vim-go and rust.vim not work normally because gvim GUI in xfce in Arch do not get correct ${env} defined in .bashrc, so lacking such as $GOPATH, $CARGO_HOME.
They worked fine in a vim starting from shell. Need to check some other information about gvim GUI.
Not related to private vimrc/bundle/ path.