Leonardo de Moura d85c30fde1 perf(library/init/data): mark usize, uint16, uint32 and uint64 as [irreducible] ... Without these annotations, Lean will timeout when trying to synthesize the type class instance `decidable_eq uint32`. The type class resolution problem will produce the unification problem: ``` decidable (@eq uint32 a b) =?= decidable (@eq usize ?x ?y) ``` which Lean tries to solve by assigning `?x := a`. During the assignment, the types of `?x` and `a` are unified with "full force". Thus, we get the constraint ``` usize_sz =?= uint32_sz ``` which will take forever to be solved when peforming the computation in unary arithmetic. Remark: this commit also makes sure that `type_context` will not unfold irreducible definitions when trying to unify/match the types. The new test `type_class_performance1.lean` exposes the problem fixed by this commit.		2018-05-07 18:07:04 -07:00
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basic.lean	perf(library/init/data): mark usize, uint16, uint32 and uint64 as [irreducible]	2018-05-07 18:07:04 -07:00
default.lean	feat(library/init/data/array): store dimension in the array	2018-05-03 15:43:03 -07:00