unresolved import `syntax::parse::common`

[rubo77]

services:    Compiling rocket_contrib v0.3.12
services: error[E0432]: unresolved import `syntax::parse::common`
services:  --> /var/lib/ff-node-monitor/.cargo/registry/src/github.com-1ecc6299db9ec823/rocket_codegen-0.3.12/src/utils/parser_ext.rs:5:20                                                                
services:   |                                                                                                                                                                                             
services: 5 | use syntax::parse::common::SeqSep;                                                                                                                                                          
services:   |                    ^^^^^^ Could not find `common` in `parse`                                                                                                                                
services: error: aborting due to previous error

[rubo77]

You need to use a certain older nightly to solve this:

sudo -u ff-node-monitor /var/lib/ff-node-monitor/.cargo/bin/rustup default nightly-2018-06-10

see: #3 (comment)