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$ cargo build
… <hundreds of dependencies build sucessfully> …
error[E0596]: cannot borrow `**func` as mutable, as it is behind a `*const` pointer
   --> /home/joz/.cargo/registry/src/github.com-1ecc6299db9ec823/gstreamer-0.9.1/src/iterator.rs:419:8
    |
415 |     let func = func as *const &mut (FnMut(T) -> bool);
    |         ---- help: consider changing this to be a mutable pointer: `*mut &mut dyn std::ops::FnMut(T) -> bool`
...
419 |     if (*func)(value) {
    |        ^^^^^^^ `func` is a `*const` pointer, so the data it refers to cannot be borrowed as mutable

error[E0596]: cannot borrow `**func` as mutable, as it is behind a `*const` pointer
   --> /home/joz/.cargo/registry/src/github.com-1ecc6299db9ec823/gstreamer-0.9.1/src/iterator.rs:435:5
    |
431 |     let func = func as *const &mut (FnMut(T));
    |         ---- help: consider changing this to be a mutable pointer: `*mut &mut dyn std::ops::FnMut(T)`
...
435 |     (*func)(value);
    |     ^^^^^^^ `func` is a `*const` pointer, so the data it refers to cannot be borrowed as mutable

error[E0596]: cannot borrow `**func` as mutable, as it is behind a `*const` pointer
   --> /home/joz/.cargo/registry/src/github.com-1ecc6299db9ec823/gstreamer-0.9.1/src/iterator.rs:453:11
    |
447 |     let func = func as *const &mut (FnMut(U, T) -> Result<U, U>);
    |         ---- help: consider changing this to be a mutable pointer: `*mut &mut dyn std::ops::FnMut(U, T) -> std::result::Result<U, U>`
...
453 |     match (*func)(accum.take().unwrap(), value) {
    |           ^^^^^^^ `func` is a `*const` pointer, so the data it refers to cannot be borrowed as mutable

   Compiling tokio-threadpool v0.1.10
   Compiling tokio-tcp v0.1.3
error: aborting due to 3 previous errors

For more information about this error, try `rustc --explain E0596`.
error: could not compile `gstreamer`.
warning: build failed, waiting for other jobs to finish...
error: build failed

$ rustc -V
rustc 1.42.0 (b8cedc004 2020-03-09)