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compile async await function error #53989

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Brooooooklyn opened this Issue Sep 6, 2018 · 1 comment

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@Brooooooklyn
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Brooooooklyn commented Sep 6, 2018

Error message:
error: internal compiler error: librustc/infer/region_constraints/mod.rs:659: cannot relate bound region: ReLateBound(DebruijnIndex(1), BrAnon(2)) <= '_#0r

Backtrace:

thread 'main' panicked at 'Box<Any>', librustc_errors/lib.rs:525:9
query stack during panic:
#0 [evaluate_obligation] evaluating trait selection obligation `impl std::future::Future: std::marker::Send`
#1 [typeck_tables_of] processing `main`
#2 [typeck_tables_of] processing `main::{{closure}}`
#3 [type_of] processing `main::{{closure}}`
end of query stack
error: aborting due to previous error
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paracat commented Nov 25, 2018

while not exactly the same, i have created a commit for the project reflow that produces a compiler error involving bound region and DebruijnIndex

paracat/reflow@a82b57c

It happened when I'm trying to replace &mut TcpStream with AsyncRead

the commit that comes before this one compiles fine. this should make it easier for the Rust team to locate the error

this is probably related to #55809
with some minor changes i can produce that error

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