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Rust 1.20 regression, multiqueue 0.3.2, match arms have incompatible types #42842

@brson

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@brson

https://github.com/schets/multiqueue

brian@ip-10-145-43-250:/mnt2/dev/multiqueue⟫ git log -1 commit f28f252a0c77d628d18192913d5a8049d85e9a1e Merge: 133dc88 b3c40d6 Author: Samuel Schetterer <samschet@gmail.com> Date: Wed Apr 5 12:14:19 2017 -0400 Merge pull request #12 from schets/fix_sync_req Added proper Sync requirements for Broadcast Queues 
brian@ip-10-145-43-250:/mnt2/dev/euclid⟫ rustc +beta -Vv rustc 1.19.0-beta.2 (a175ee509 2017-06-15) binary: rustc commit-hash: a175ee509bca5069b01cea9a35c6f333d2250eee commit-date: 2017-06-15 host: x86_64-unknown-linux-gnu release: 1.19.0-beta.2 LLVM version: 4.0 
error[E0308]: match arms have incompatible types --> src/bin/example.rs:107:29 | 107 | scope.spawn(move || for val in single_recv.iter_with(|item_ref| 10 * *item_ref) { | _____________________________^ 108 | | println!("{}", val); 109 | | }); | |_________^ expected (), found i32 | = note: expected type `()` found type `i32` note: match arm with an incompatible type --> src/bin/example.rs:107:29 | 107 | scope.spawn(move || for val in single_recv.iter_with(|item_ref| 10 * *item_ref) { | _____________________________^ 108 | | println!("{}", val); 109 | | }); | |_________^ error[E0308]: match arms have incompatible types --> src/bin/example.rs:114:29 | 114 | scope.spawn(move || for val in | _____________________________^ 115 | | single_recv_2.try_iter_with(|item_ref| 10 * *item_ref) { 116 | | println!("{}", val); 117 | | }); | |_________^ expected (), found i32 | = note: expected type `()` found type `i32` note: match arm with an incompatible type --> src/bin/example.rs:114:29 | 114 | scope.spawn(move || for val in | _____________________________^ 115 | | single_recv_2.try_iter_with(|item_ref| 10 * *item_ref) { 116 | | println!("{}", val); 117 | | }); | |_________^ error: aborting due to previous error(s) error: Could not compile `multiqueue`. 

cc @schets

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