[blocks B      ] dev-util/cargo ("dev-util/cargo" is blocking dev-lang/rust-bin-1.32.0, dev-lang/rust-1.32.0)

 * Error: The above package list contains packages which cannot be
 * installed at the same time on the same system.

  (dev-util/cargo-0.30.0-r1:0/0::gentoo, ebuild scheduled for merge) pulled in by
    >=dev-util/cargo-0.30.0 required by (dev-lang/rust-1.29.1-r1:stable/1.29::gentoo, ebuild scheduled for merge)

  (dev-lang/rust-bin-1.32.0:stable/stable::gentoo, ebuild scheduled for merge) pulled in by
    =dev-lang/rust-bin-1.32.0* required by (virtual/rust-1.32.0:0/0::gentoo, ebuild scheduled for merge)


For more information about Blocked Packages, please refer to the following
section of the Gentoo Linux x86 Handbook (architecture is irrelevant):

https://wiki.gentoo.org/wiki/Handbook:X86/Working/Portage#Blocked_packages