Merge pull request #15919 from JuliaLang/nl/dec

Fix inference for string(::IntXX)

Author: vtjnash

base/intfuncs.jl

@@ -228,6 +228,8 @@ ndigits(x::Integer) = ndigits(unsigned(abs(x)))
 
 ## integer to string functions ##
 
+string(x::Union{Int8,Int16,Int32,Int64,Int128}) = dec(x)
+
 function bin(x::Unsigned, pad::Int, neg::Bool)
     i = neg + max(pad,sizeof(x)<<3-leading_zeros(x))
     a = Array(UInt8,i)

base/parse.jl

@@ -145,10 +145,6 @@ function parse{T<:Integer}(::Type{T}, s::AbstractString, base::Integer)
 end
 parse{T<:Integer}(::Type{T}, s::AbstractString) = get(tryparse_internal(T, s, 0, true))
 
-## stringifying integers more efficiently ##
-
-string(x::Union{Int8,Int16,Int32,Int64,Int128}) = dec(x)
-
 ## string to float functions ##
 
 tryparse(::Type{Float64}, s::ByteString) = ccall(:jl_try_substrtod, Nullable{Float64}, (Ptr{UInt8},Csize_t,Csize_t), s, 0, sizeof(s))

test/intfuncs.jl

@@ -135,3 +135,6 @@ let ptr = Ptr{Void}(typemax(UInt))
         @test typeof(Ptr{Float64}(T(ptr))) == Ptr{Float64}
     end
 end
+
+# issue #15911
+@inferred string(1)