Problems for source package rust-syn-1

BuildDepends

Package declares a build time dependency on librust-proc-macro2-1+proc-macro-dev (>= 1.0.46-~~) <!nocheck> which cannot be satisfied on mips64el. Package rust-syn-1 does not exist on mips64el.
Package declares a build time dependency on librust-proc-macro2-1+proc-macro-dev (>= 1.0.46-~~) <!nocheck> which cannot be satisfied on armel. Package rust-syn-1 does not exist on armel.
Package declares a build time dependency on librust-quote-1-dev <!nocheck> which cannot be satisfied on mips64el. Package rust-syn-1 does not exist on mips64el.
Package declares a build time dependency on librust-quote-1-dev <!nocheck> which cannot be satisfied on armel. Package rust-syn-1 does not exist on armel.
Package declares a build time dependency on librust-unicode-ident-1+default-dev <!nocheck> which cannot be satisfied on mips64el. Package rust-syn-1 does not exist on mips64el.
Package declares a build time dependency on librust-unicode-ident-1+default-dev <!nocheck> which cannot be satisfied on armel. Package rust-syn-1 does not exist on armel.
Package declares a build time dependency on libstd-rust-dev <!nocheck> which cannot be satisfied on armel. Package rust-syn-1 does not exist on armel.
Package declares a build time dependency on libstd-rust-dev <!nocheck> which cannot be satisfied on mips64el. Package rust-syn-1 does not exist on mips64el.
Package declares a build time dependency on librust-proc-macro2-1-dev (>= 1.0.46-~~) <!nocheck> which cannot be satisfied on mips64el. Package rust-syn-1 does not exist on mips64el.
Package declares a build time dependency on librust-proc-macro2-1-dev (>= 1.0.46-~~) <!nocheck> which cannot be satisfied on armel. Package rust-syn-1 does not exist on armel.
Package declares a build time dependency on dh-sequence-cargo which cannot be satisfied on armel. Package rust-syn-1 does not exist on armel.
Package declares a build time dependency on dh-sequence-cargo which cannot be satisfied on mips64el. Package rust-syn-1 does not exist on mips64el.
Package declares a build time dependency on debhelper-compat (= 13) which cannot be satisfied on armel. Package rust-syn-1 does not exist on armel.
Package declares a build time dependency on debhelper-compat (= 13) which cannot be satisfied on mips64el. Package rust-syn-1 does not exist on mips64el.
Package declares a build time dependency on librust-quote-1+proc-macro-dev <!nocheck> which cannot be satisfied on mips64el. Package rust-syn-1 does not exist on mips64el.
Package declares a build time dependency on librust-quote-1+proc-macro-dev <!nocheck> which cannot be satisfied on armel. Package rust-syn-1 does not exist on armel.

Malformed Build-Depends

Package declares a build time dependency on 'cargo:native <!nocheck>' which is broken Syntax.
Package declares a build time dependency on 'rustc:native (>= 1.31) <!nocheck>' which is broken Syntax.