fix bug in t-function for >: (JuliaLang#35136)

oxinabox · Apr 8, 2020 · 048fc5e · 048fc5e
1 parent 62a57e5
commit 048fc5e
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diff --git a/base/compiler/abstractinterpretation.jl b/base/compiler/abstractinterpretation.jl
@@ -851,7 +851,7 @@ function abstract_call_known(@nospecialize(f), fargs::Union{Nothing,Vector{Any}}
     elseif la == 3 && istopfunction(f, :(>:))
         # mark issupertype as a exact alias for issubtype
         # swap T1 and T2 arguments and call <:
-        if length(fargs) == 3
+        if fargs !== nothing && length(fargs) == 3
             fargs = Any[<:, fargs[3], fargs[2]]
         else
             fargs = nothing

diff --git a/test/compiler/inference.jl b/test/compiler/inference.jl
@@ -2541,3 +2541,5 @@ end
 @test pickvarnames(Any[:a, :b]) === (:a, :b)
 @test only(Base.return_types(pickvarnames, (Vector{Any},))) == Tuple{Vararg{Union{Symbol, Tuple}}}
 @test only(Base.code_typed(pickvarnames, (Vector{Any},), optimize=false))[2] == Tuple{Vararg{Union{Symbol, Tuple{Vararg{Union{Symbol, Tuple}}}}}}
+
+@test map(>:, [Int], [Int]) == [true]