deal with closure in chain methods #18

Job	Run time
build (BurntSushi/aho-corasick)	2m 28s
build (rust-lang/rust-bindgen)	3m 38s
build (dtolnay/cxx)	3m 11s
build (rust-bakery/nom)	3m 45s
build (sfackler/rust-openssl)	3m 14s
build (serde-rs/serde)	2m 28s
build (clap-rs/clap)	2m 52s
build (tokio-rs/tracing)	2m 59s
build (brendanzab/codespan)	2m 41s
build (rust-lang/regex)	2m 36s
build (dtolnay/syn)	2m 52s
	32m 44s

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