env GOFLAGS='$(echo ''cc"''; echo ''OOPS="oops'')'
go env
[GOOS:darwin] stdout 'GOFLAGS=''\$\(echo ''\\''''cc"''\\''''; echo ''\\''''OOPS="oops''\\''''\)'''
[GOOS:linux] stdout 'GOFLAGS=''\$\(echo ''\\''''cc"''\\''''; echo ''\\''''OOPS="oops''\\''''\)'''
[GOOS:windows] stdout 'set GOFLAGS=\$\(echo ''cc"''; echo ''OOPS="oops''\)'