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Duplicate outputs in compile message. #5128

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@zoumi

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@zoumi

Here is the compile error message:

cargo test
   Compiling zmrequest v0.1.0 (file:///H:/work/rust_projects/zmrequest)
error[E0499]: cannot borrow `self._cookies` as mutable more than once at a time
   --> src\cookiejar.rs:104:17
    |
98  |         match self._cookies.get_mut(host)
    |               ------------- first mutable borrow occurs here
...
104 |                 self._cookies.insert(host.to_owned(),m);
    |                 ^^^^^^^^^^^^^ second mutable borrow occurs here
105 |             }
106 |         }
    |         - first borrow ends here

error[E0499]: cannot borrow `self._cookies` as mutable more than once at a time
   --> src\cookiejar.rs:104:17
    |
98  |         match self._cookies.get_mut(host)
    |               ------------- first mutable borrow occurs here
...
104 |                 self._cookies.insert(host.to_owned(),m);
    |                 ^^^^^^^^^^^^^ second mutable borrow occurs here
105 |             }
106 |         }
    |         - first borrow ends here

error: aborting due to previous error

error: aborting due to previous error

If you want more information on this error, try using "rustc --explain If you want more information on this error, try using "rustc --explain E0499E0499"
"
error: Could not compile `zmrequest`.
warning: build failed, waiting for other jobs to finish...
error: Could not compile `zmrequest`.

To learn more, run the command again with --verbose.

Rust version:

rustup show
Default host: x86_64-pc-windows-gnu

installed toolchains
--------------------

nightly-i686-pc-windows-gnu (default)
nightly-i686-pc-windows-msvc

active toolchain
----------------

nightly-i686-pc-windows-gnu (default)
rustc 1.26.0-nightly (3eeb5a665 2018-03-01)

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