Could not compile `rustc-serialize`.

gistfile1.txt

   Compiling rustc-serialize v0.3.15
/home/raijin/.cargo/registry/src/github.com-0a35038f75765ae4/rustc-serialize-0.3.15/src/serialize.rs:201:5: 201:64 warning: the trait `core::marker::Sized` is not implemented for the type `Self` [E0277]
/home/raijin/.cargo/registry/src/github.com-0a35038f75765ae4/rustc-serialize-0.3.15/src/serialize.rs:201     fn decode<D: Decoder>(d: &mut D) -> Result<Self, D::Error>;
                                                                                                             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/raijin/.cargo/registry/src/github.com-0a35038f75765ae4/rustc-serialize-0.3.15/src/serialize.rs:201:5: 201:64 help: run `rustc --explain E0277` to see a detailed explanation
/home/raijin/.cargo/registry/src/github.com-0a35038f75765ae4/rustc-serialize-0.3.15/src/serialize.rs:201:5: 201:64 note: `Self` does not have a constant size known at compile-time
/home/raijin/.cargo/registry/src/github.com-0a35038f75765ae4/rustc-serialize-0.3.15/src/serialize.rs:201     fn decode<D: Decoder>(d: &mut D) -> Result<Self, D::Error>;
                                                                                                             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/raijin/.cargo/registry/src/github.com-0a35038f75765ae4/rustc-serialize-0.3.15/src/serialize.rs:201:5: 201:64 note: this warning results from recent bug fixes and clarifications; it will become a HARD ERROR in the next release. See RFC 1214 for details.
/home/raijin/.cargo/registry/src/github.com-0a35038f75765ae4/rustc-serialize-0.3.15/src/serialize.rs:201     fn decode<D: Decoder>(d: &mut D) -> Result<Self, D::Error>;
                                                                                                             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/raijin/.cargo/registry/src/github.com-0a35038f75765ae4/rustc-serialize-0.3.15/src/serialize.rs:201:5: 201:64 note: required by `core::result::Result`
/home/raijin/.cargo/registry/src/github.com-0a35038f75765ae4/rustc-serialize-0.3.15/src/serialize.rs:201     fn decode<D: Decoder>(d: &mut D) -> Result<Self, D::Error>;
                                                                                                             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Build failed, waiting for other jobs to finish...
Could not compile `rustc-serialize`.
[raijin@raimote][~/build/aur/systemd-crontab-generator/src/systemd-cron-next-master]%make clean     
rm -rf /home/raijin/build/aur/systemd-crontab-generator/src/systemd-cron-next-master/out
[raijin@raimote][~/build/aur/systemd-crontab-generator/src/systemd-cron-next-master]%make build     
mkdir -p /home/raijin/build/aur/systemd-crontab-generator/src/systemd-cron-next-master/out/build
mkdir -p /home/raijin/build/aur/systemd-crontab-generator/src/systemd-cron-next-master/out/build/bin
mkdir -p /home/raijin/build/aur/systemd-crontab-generator/src/systemd-cron-next-master/out/build/man
mkdir -p /home/raijin/build/aur/systemd-crontab-generator/src/systemd-cron-next-master/out/build/units
cargo build --release
    Updating registry `https://github.com/rust-lang/crates.io-index`
failed to select a version for `rustc-serialize` (required by `systemd-crontab-generator`):
all possible versions conflict with previously selected versions of `rustc-serialize`
  version 0.3.15 in use by rustc-serialize v0.3.15
  possible versions to select: 0.3.16
Makefile:67: recipe for target 'build' failed
make: *** [build] Error 101