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[0, nothing, 0.0, missing] throws MethodError in 1.3.0-alpha.38 #32777

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tkf opened this issue Aug 3, 2019 · 2 comments · Fixed by #32788
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[0, nothing, 0.0, missing] throws MethodError in 1.3.0-alpha.38 #32777

tkf opened this issue Aug 3, 2019 · 2 comments · Fixed by #32788
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@JeffBezanson
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types and dispatch Types, subtyping and method dispatch

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@tkf
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tkf commented Aug 3, 2019 

julia> VERSION
v"1.3.0-alpha.38"

julia> [0, nothing, 0.0, missing]
ERROR: MethodError: convert(::Type{Union{Missing, Nothing, Float64}}, ::Int64) is ambiguous. Candidates:
  convert(::Type{Union{Missing, T}}, x) where T in Base at missing.jl:42
  convert(::Type{Union{Nothing, T}}, x) where T in Base at some.jl:23
Possible fix, define
  convert(::Type{Union{Missing, Nothing}}, ::Any)
Stacktrace:
 [1] setindex!(::Array{Union{Missing, Nothing, Float64},1}, ::Int64, ::Int64) at ./array.jl:780
 [2] copyto!(::Array{Union{Missing, Nothing, Float64},1}, ::Tuple{Int64,Nothing,Float64,Missing}) at ./abstractarray.jl:725
 [3] vect(::Int64, ::Vararg{Any,N} where N) at ./array.jl:151
 [4] top-level scope at REPL[2]:1

It works in 1.2.0-rc2.0.
@JeffBezanson
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Seems to be caused by c9dd565

@JeffBezanson JeffBezanson self-assigned this Aug 3, 2019
@JeffBezanson JeffBezanson added the types and dispatch Types, subtyping and method dispatch label Aug 3, 2019
JeffBezanson added a commit that referenced this issue Aug 4, 2019
@JeffBezanson
fix #32777, regression in type intersection of unions
e2b32fa 
Fortunately, #32771 allows reverting the offending change.
@JeffBezanson JeffBezanson mentioned this issue Aug 4, 2019
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@JeffBezanson
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Note: problem exists on backports-1.2.0 branch; was introduced since rc2.

JeffBezanson added a commit that referenced this issue Aug 5, 2019
@JeffBezanson
fix #32777, regression in type intersection of unions (#32788)
c158ff2 
Fortunately, #32771 allows reverting the offending change.
JeffBezanson added a commit that referenced this issue Aug 5, 2019
@JeffBezanson
fix #32777, regression in type intersection of unions (#32788)
a5d351d 
Fortunately, #32771 allows reverting the offending change.
(cherry picked from commit c158ff2)
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fix #32777, regression in type intersection of unions JuliaLang/julia
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@tkf @JeffBezanson