add a nop conversion for some (#31536)

JuliaLang · Mar 29, 2019 · 4b12302 · 4b12302
1 parent 9f125f9
commit 4b12302
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/base/some.jl b/base/some.jl
@@ -16,6 +16,7 @@ promote_rule(::Type{Some{T}}, ::Type{Some{S}}) where {T, S<:T} = Some{T}
 promote_rule(::Type{Some{T}}, ::Type{Nothing}) where {T} = Union{Some{T}, Nothing}
 
 convert(::Type{Some{T}}, x::Some) where {T} = Some{T}(convert(T, x.value))
+convert(::Type{Some{T}}, x::Some{T}) where {T} = x
 convert(::Type{Union{Some{T}, Nothing}}, x::Some) where {T} = convert(Some{T}, x)
 
 convert(::Type{Union{T, Nothing}}, x::Union{T, Nothing}) where {T} = x