Make rest type-idempotent (JuliaLang#30871)

halleysfifthinc · Jan 29, 2019 · 05acc22 · 05acc22
1 parent 9a1cc63
commit 05acc22
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diff --git a/base/iterators.jl b/base/iterators.jl
@@ -462,6 +462,7 @@ julia> collect(Iterators.rest([1,2,3,4], 2))
 ```
 """
 rest(itr,state) = Rest(itr,state)
+rest(itr::Rest,state) = Rest(itr.itr,state)
 rest(itr) = itr
 
 """

diff --git a/test/iterators.jl b/test/iterators.jl
@@ -72,6 +72,7 @@ let s = "hello"
  c = collect(rest(s, st))
  @test c == ['e','l','l','o']
  @test c isa Vector{Char}
+ @test rest(s, st) == rest(rest(s,4),st)
 end
 
 @test_throws MethodError collect(rest(countfrom(1), 5))