rust spent 10 minutes trying to suggest typos #110723
Description
enum A<A> { A(A), A { C: A }, } // Make sure that we aren't using `self::` in paths, since it doesn't work in // non-module scopes. const A: () = { #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Hash)] struct A<A: A>(B) where A: A< { #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Default, Hash)] struct A<A> { A: A, } #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Hash)] struct A< A: A< { #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Hash)] struct A<A: A>(B) where A: A< { #[derive( Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Hash, )] struct A< A: A< { #[derive( Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Hash, )] struct A<A: A>(B) where A: A<{ continue }>; }, >, >(B) where A: A<{ continue }>; }, >; #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Hash)] enum A<A> { A(), A { A: A }, } }, >, >(B) where A: A<{ continue }>; }, >; };time: 0.001; rss: 45MB -> 49MB ( +4MB) parse_crate time: 0.000; rss: 49MB -> 53MB ( +4MB) setup_global_ctxt error[E0428]: the name `A` is defined multiple times --> 894ADFAEF56FD5BE3968F44425D02AB0BFB037BD9F3CC014F7CF27D10A73C642.rs:5:5 | 4 | A(A), | ---- previous definition of the type `A` here 5 | A { C: A }, | ^ `A` redefined here | = note: `A` must be defined only once in the type namespace of this enum error[E0428]: the name `A` is defined multiple times --> 894ADFAEF56FD5BE3968F44425D02AB0BFB037BD9F3CC014F7CF27D10A73C642.rs:22:17 | 17 | struct A<A> { | ----------- previous definition of the type `A` here ... 22 | / struct A< 23 | | A: A< 24 | | { 25 | | #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Hash)] ... | 65 | | where 66 | | A: A<{ continue }>; | |_______________________________________^ `A` redefined here | = note: `A` must be defined only once in the type namespace of this block error[E0428]: the name `A` is defined multiple times --> 894ADFAEF56FD5BE3968F44425D02AB0BFB037BD9F3CC014F7CF27D10A73C642.rs:58:29 | 26 | / ... struct A<A: A>(B) 27 | | ... where 28 | | ... A: A< 29 | | ... { ... | 54 | | ... }, 55 | | ... >; | |____________________________- previous definition of the type `A` here ... 58 | ... enum A<A> { | ^^^^^^^^^ `A` redefined here | = note: `A` must be defined only once in the type namespace of this block error[E0428]: the name `A` is defined multiple times --> 894ADFAEF56FD5BE3968F44425D02AB0BFB037BD9F3CC014F7CF27D10A73C642.rs:60:33 | 59 | ... A(), | --- previous definition of the type `A` here 60 | ... A { A: A }, | ^ `A` redefined here | = note: `A` must be defined only once in the type namespace of this enum time: 8.261; rss: 53MB -> 1032MB ( +978MB) expand_crate time: 8.261; rss: 53MB -> 1032MB ( +978MB) macro_expand_crate time: 1.143; rss: 1032MB -> 1028MB ( -4MB) AST_validation time: 0.010; rss: 1028MB -> 1028MB ( +0MB) check_reexport_ambiguities time: 0.585; rss: 1028MB -> 1038MB ( +10MB) finalize_macro_resolutions This probably generates massive amount of code hence the 50mb -> 1gb blowup.
After these lines, it looks like rustc hangs while it spends a lot of time (I killed it after 10 minutes of waiting) inside
29,39% librustc_driver-e9ace2a97781a33e.so [.] <rustc_resolve::Resolver>::add_module_candidates::<&<rustc_resolve::late::LateResolutionVisitor>::suggest_typo::{closure#0}> 27,42% librustc_driver-e9ace2a97781a33e.so [.] <rustc_resolve::Resolver>::add_module_candidates::<&<rustc_resolve::late::LateResolutionVisitor>::try_lookup_name_relaxed::{closure#0}> 13,17% librustc_driver-e9ace2a97781a33e.so [.] <rustc_resolve::Resolver>::lookup_import_candidates_from_module::<&&<rustc_resolve::late::LateResolutionVisitor>::try_lookup_name_relaxed::{closure#0}> 1,27% librustc_driver-e9ace2a97781a33e.so [.] <rustc_resolve::ModuleData>::nearest_parent_mod 1,09% librustc_driver-e9ace2a97781a33e.so [.] <rustc_resolve::Resolver>::lookup_import_candidates_from_module::<&&<rustc_resolve::late::LateResolutionVisitor>::try_lookup_name_relaxed::{closure#1}>