Fix reduce(vcat,...) type inference (JuliaLang#40277)

dlfivefifty · Apr 1, 2021 · fd77ae6 · fd77ae6
1 parent 13caa8a
commit fd77ae6
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/base/abstractarray.jl b/base/abstractarray.jl
@@ -1490,7 +1490,7 @@ AbstractVecOrTuple{T} = Union{AbstractVector{<:T}, Tuple{Vararg{T}}}
 
 _typed_vcat_similar(V, ::Type{T}, n) where T = similar(V[1], T, n)
 _typed_vcat(::Type{T}, V::AbstractVecOrTuple{AbstractVector}) where T =
-    _typed_vcat!(_typed_vcat_similar(V, T, mapreduce(length, +, V)), V)
+    _typed_vcat!(_typed_vcat_similar(V, T, sum(map(length, V))), V)
 
 function _typed_vcat!(a::AbstractVector{T}, V::AbstractVecOrTuple{AbstractVector}) where T
     pos = 1