deprecated int method fails for non-concrete arrays of strings

[peeterjoot]

I asked a question like the following on stackoverflow and Matt B asked me to report this as an issue, stating "The deprecated method should work and the warning message should print a valid suggestion"

I'm unable to convert integer regular expression captures values to an array of integers in Julia 0.4.

In Julia 0.3 I could do this with int(), basically like:

c = ["1", "2"] ;
int(c)

But in Julia 0.4, this works for regular strings:

julia> c = ["1", "2"] ;

julia> int(c)
2-element Array{Int64,1}:
 1
 2

but doesn't work with substrings (i.e. regex captures):

re_dcIV = r"^
([IV])(\S+)\s+
(\d+)\s+
(\d+)\s+
DC\s+
(\S+)\s*$"x ;

line = "V1 1 2 DC 1" ;

m = match( re_dcIV, line ) ;

c = m.captures ;
println( "$c\n" ) ;

nodes = int(c[3:4]) ;

which produces:

julia> nodes = int(c[3:4]) ;
WARNING: int(x::AbstractArray) is deprecated, use round(Int64,x) instead.
 in depwarn at deprecated.jl:63
 in int at deprecated.jl:49
while loading no file, in expression starting on line 0
ERROR: MethodError: `round` has no method matching round(::Type{Int64}, ::SubString{UTF8String})
Closest candidates are:
  round{T<:Integer}(::Type{T<:Integer}, ::Integer)
  round{T<:Integer}(::Type{T<:Integer}, ::Float16)
  round{T<:Union{Signed,Unsigned}}(::Type{T<:Union{Signed,Unsigned}}, ::Base.MPFR.BigFloat)
  ...
 in round at floatfuncs.jl:72
 in int at deprecated.jl:51

The type of the capture array is:

Union{SubString{UTF8String},Void}["V","1","1","2","1"]

and I'm not able to execute int(c[3:4]) on a subset of that beastie.

[yuyichao]

int is deprecated. Use

julia> map(x->parse(Int, x), c[3:4])
2-element Array{Int64,1}:
 1
 2

The deprecated isue is wrong though.

[mbauman]

Thanks! More specifically:

# Julia-0.3
julia> int(Any["1","2"])
2-element Array{Int64,1}:
 1
 2

# Julia-0.4
julia> int(Any["1","2"])
WARNING: int(x::AbstractArray) is deprecated, use round(Int64,x) instead.
 in depwarn at /Users/mbauman/Applications/julia-0.4/lib/julia/sys.dylib
 in int at deprecated.jl:49
while loading no file, in expression starting on line 0
ERROR: MethodError: `round` has no method matching round(::Type{Int64}, ::ASCIIString)
Closest candidates are:
  round{T<:Integer}(::Type{T<:Integer}, ::Integer)
  round{T<:Integer}(::Type{T<:Integer}, ::Float16)
  round{T<:Union{Signed,Unsigned}}(::Type{T<:Union{Signed,Unsigned}}, ::Base.MPFR.BigFloat)
  ...
 in round at floatfuncs.jl:72
 in int at deprecated.jl:51

[tkelman]

backported in #13107