magnet_app-0.0.1 beta regression because of diesel

[est31]

magnet_app version 0.0.1 regressed from stable to beta because it depends on diesel 0.7.1 and diesel broke (full log):

Aug 03 09:39:48.109 INFO kablam! error: unexpected end of macro invocation
Aug 03 09:39:48.109 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/diesel-0.7.1/src/connection/mod.rs:49:9
Aug 03 09:39:48.109 INFO kablam!    |
Aug 03 09:39:48.109 INFO kablam! 49 |         assert_eq!(self.get_transaction_depth(), 0);
Aug 03 09:39:48.109 INFO kablam!    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Aug 03 09:39:48.109 INFO kablam!    |
Aug 03 09:39:48.109 INFO kablam!    = note: this error originates in a macro outside of the current crate

cc @stefanoc

[arielb1]

Looks like there's a column macro in https://github.com/diesel-rs/diesel/blob/v0.7.1/diesel/src/macros/mod.rs. Duplicate of #43057.

[alexcrichton]

Fixed in #43735