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authorbors[bot] <26634292+bors[bot]@users.noreply.github.com>2019-09-24 22:12:26 +0100
committerGitHub <[email protected]>2019-09-24 22:12:26 +0100
commitc7420ddaaa76741d1eebe393406b38ba5596e54a (patch)
treeff9c2f3c665ef95ebf509dc69ff82d39ec42d176 /crates/ra_tools/src
parent36fb3f53d712a11b7e3fc4bbd92094d1c8f19522 (diff)
parent6a8670665032f6103ca14e38ed9106126b20063d (diff)
Merge #1845
1845: Closure types r=flodiebold a=flodiebold This adds types for closures and makes them implement the `Fn` traits (we don't currently care or try to infer `Fn` vs. `FnMut` vs. `FnOnce`; this would require move analysis, I think). This requires some changes in Chalk; one is that we need to know the self type when asked for impls, so we can synthesize `Fn` trait impls for closures; but also there's a problem that prevents us from normalizing the closure output type correctly that I _think_ will be fixed on the Chalk side (basically, we ask too early and try to solve `Normalize(<?1 as FnOnce<(u32,)>>::Output => ?0)` -- note the variable in the self type -- and instead of an ambiguous answer, we get back that it can't be solved, so we don't try again. Niko mentioned he's making all goals where the self type is unconstrained flounder, which I think would mean this would be ambiguous). Co-authored-by: Florian Diebold <[email protected]>
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