vlib/v/checker/tests/array_plus_assign_err.vv:1:5: warning: unused variable: `buffer`
    1 | mut buffer := []u8{cap: 1024}
      |     ~~~~~~
    2 | buffer += "ipconfig && sudo apt-get install -y some_amazing_package name + command output".bytes()
vlib/v/checker/tests/array_plus_assign_err.vv:2:1: error: operator `+=` not defined on left operand type `[]u8`
    1 | mut buffer := []u8{cap: 1024}
    2 | buffer += "ipconfig && sudo apt-get install -y some_amazing_package name + command output".bytes()
      | ~~~~~~