Clean up Symbol usage (after symbol deprecation).

From comments by stevengj in #15995.

base/broadcast.jl

@@ -167,7 +167,7 @@ function gen_broadcast_body_iter_tobitarray(nd::Int, narrays::Int, f)
 end
 
 function gen_broadcast_function(genbody::Function, nd::Int, narrays::Int, f)
-    As = [Symbol("A_"*string(i)) for i = 1:narrays]
+    As = [Symbol("A_",i) for i = 1:narrays]
     body = genbody(nd, narrays, f)
     @eval let
         local _F_
@@ -179,7 +179,7 @@ function gen_broadcast_function(genbody::Function, nd::Int, narrays::Int, f)
 end
 
 function gen_broadcast_function_tobitarray(genbody::Function, nd::Int, narrays::Int, f)
-    As = [Symbol("A_"*string(i)) for i = 1:narrays]
+    As = [Symbol("A_",i) for i = 1:narrays]
     body = genbody(nd, narrays, f)
     @eval let
         local _F_

base/dates/arithmetic.jl

@@ -67,7 +67,7 @@ end
 (-)(y::Period,x::TimeType) = x - y
 
 for op in (:.+, :.-)
-    op_ = Symbol(string(op)[2:end])
+    op_ = Symbol(string(op)[2])
     @eval begin
         # GeneralPeriod, AbstractArray{TimeType}
         ($op){T<:TimeType}(x::AbstractArray{T}, y::GeneralPeriod) =

base/dates/periods.jl

@@ -95,7 +95,7 @@ for (op,Ty,Tz) in ((:.*,Real,:P),
                    (:.%,:P,:P),
                    (:mod,:P,:P))
     sop = string(op)
-    op_ = sop[1] == '.' ? Symbol(sop[2:end]) : op
+    op_ = sop[1] == '.' ? Symbol(sop[2]) : op
     @eval begin
         function ($op){P<:Period}(X::StridedArray{P},y::$Ty)
             Z = similar(X, $Tz)
@@ -234,7 +234,7 @@ GeneralPeriod = Union{Period,CompoundPeriod}
 (+){P<:GeneralPeriod}(x::StridedArray{P}) = x
 
 for op in (:.+, :.-)
-    op_ = Symbol(string(op)[2:end])
+    op_ = Symbol(string(op)[2])
     @eval begin
         function ($op){P<:GeneralPeriod}(X::StridedArray{P},y::GeneralPeriod)
             Z = similar(X, CompoundPeriod)

base/dft.jl

@@ -31,7 +31,7 @@ complexfloat{T<:Real}(x::AbstractArray{T}) = copy!(Array(typeof(complex(float(on
 # implementations only need to provide plan_X(x, region)
 # for X in (:fft, :bfft, ...):
 for f in (:fft, :bfft, :ifft, :fft!, :bfft!, :ifft!, :rfft)
-    pf = Symbol(string("plan_", f))
+    pf = Symbol("plan_", f)
     @eval begin
         $f(x::AbstractArray) = $pf(x) * x
         $f(x::AbstractArray, region) = $pf(x, region) * x
@@ -179,7 +179,7 @@ bfft!
 # promote to a complex floating-point type (out-of-place only),
 # so implementations only need Complex{Float} methods
 for f in (:fft, :bfft, :ifft)
-    pf = Symbol(string("plan_", f))
+    pf = Symbol("plan_", f)
     @eval begin
         $f{T<:Real}(x::AbstractArray{T}, region=1:ndims(x)) = $f(complexfloat(x), region)
         $pf{T<:Real}(x::AbstractArray{T}, region; kws...) = $pf(complexfloat(x), region; kws...)
@@ -264,7 +264,7 @@ A_mul_B!(y::AbstractArray, p::ScaledPlan, x::AbstractArray) =
 # or odd).
 
 for f in (:brfft, :irfft)
-    pf = Symbol(string("plan_", f))
+    pf = Symbol("plan_", f)
     @eval begin
         $f(x::AbstractArray, d::Integer) = $pf(x, d) * x
         $f(x::AbstractArray, d::Integer, region) = $pf(x, d, region) * x

base/fft/dct.jl

@@ -82,7 +82,7 @@ function plan_inv{T,K,inplace}(p::DCTPlan{T,K,inplace})
 end
 
 for f in (:dct, :dct!, :idct, :idct!)
-    pf = Symbol(string("plan_", f))
+    pf = Symbol("plan_", f)
     @eval begin
         $f{T<:fftwNumber}(x::AbstractArray{T}) = $pf(x) * x
         $f{T<:fftwNumber}(x::AbstractArray{T}, region) = $pf(x, region) * x

base/libuv.jl

@@ -20,10 +20,10 @@ function uv_sizeof_req(req)
 end
 
 for h in uv_handle_types
-@eval const $(Symbol("_sizeof_"*lowercase(string(h)))) = uv_sizeof_handle($h)
+@eval const $(Symbol("_sizeof_",lowercase(string(h)))) = uv_sizeof_handle($h)
 end
 for r in uv_req_types
-@eval const $(Symbol("_sizeof_"*lowercase(string(r)))) = uv_sizeof_req($r)
+@eval const $(Symbol("_sizeof_",lowercase(string(r)))) = uv_sizeof_req($r)
 end
 
 uv_handle_data(handle) = ccall(:jl_uv_handle_data,Ptr{Void},(Ptr{Void},),handle)

base/multidimensional.jl

@@ -455,14 +455,14 @@ end
     for T in indexes.parameters
         T <: CartesianIndex ? (M += length(T)) : (M += 1)
     end
-    index_length_expr = index <: Colon ? Symbol(string("Istride_", N+1)) : :(length(index))
+    index_length_expr = index <: Colon ? Symbol("Istride_", N+1) : :(length(index))
     quote
         Cartesian.@nexprs $N d->(I_d = indexes[d])
         dimlengths = Cartesian.@ncall $N index_lengths_dim V.parent length(V.indexes)-N+1 I
         Istride_1 = 1   # strides of the indexes to merge
         Cartesian.@nexprs $N d->(Istride_{d+1} = Istride_d*dimlengths[d])
         idx_len = $(index_length_expr)
-        if idx_len < 0.1*$(Symbol(string("Istride_", N+1)))   # this has not been carefully tuned
+        if idx_len < 0.1*$(Symbol("Istride_", N+1))   # this has not been carefully tuned
             return merge_indexes_div(V, indexes, index, dimlengths)
         end
         Cartesian.@nexprs $N d->(counter_d = 1) # counter_0 is the linear index

base/sparse/sparsevector.jl

@@ -1516,7 +1516,7 @@ end
 for isunittri in (true, false), islowertri in (true, false)
     unitstr = isunittri ? "Unit" : ""
     halfstr = islowertri ? "Lower" : "Upper"
-    tritype = :(Base.LinAlg.$(Symbol(string(unitstr, halfstr, "Triangular"))))
+    tritype = :(Base.LinAlg.$(Symbol(unitstr, halfstr, "Triangular")))
 
     # build out-of-place left-division operations
     for (istrans, func, ipfunc) in (

base/stream.jl

@@ -955,7 +955,7 @@ _fd(x::IOStream) = RawFD(fd(x))
     ccall(:jl_uv_handle,Ptr{Void},(Ptr{Void},),x.handle))
 
 for (x,writable,unix_fd,c_symbol) in ((:STDIN,false,0,:jl_uv_stdin),(:STDOUT,true,1,:jl_uv_stdout),(:STDERR,true,2,:jl_uv_stderr))
-    f = Symbol("redirect_"*lowercase(string(x)))
+    f = Symbol("redirect_",lowercase(string(x)))
     _f = Symbol("_",f)
     @eval begin
         function ($_f)(stream)

base/threadcall.jl

@@ -44,7 +44,7 @@ macro threadcall(f, rettype, argtypes, argvals...)
     body = wrapper.args[2].args
     args = Symbol[]
     for (i,T) in enumerate(argtypes)
-        arg = Symbol("arg$i")
+        arg = Symbol("arg", i)
         push!(body, :($arg = unsafe_load(convert(Ptr{$T}, p))))
         push!(body, :(p += sizeof($T)))
         push!(args, arg)

test/ccall.jl

@@ -412,8 +412,8 @@ s1 = Struct1(352.39422f23, 19.287577)
 
 for (t,v) in ((Complex{Int32},:ci32),(Complex{Int64},:ci64),
               (Complex64,:cf32),(Complex128,:cf64),(Struct1,:s1))
-    fname = Symbol("foo"*string(v))
-    fname1 = Symbol("foo1"*string(v))
+    fname = Symbol("foo",v)
+    fname1 = Symbol("foo1",v)
     @eval begin
         verbose && println($t)
         a = copy($v)

test/fft.jl

@@ -39,7 +39,7 @@ true_fftd3_m3d[:,:,2] = -15
 # use invoke to force usage of CTPlan versions even if FFTW is present
 for A in (Array,SubArray)
     for f in (:fft,:ifft,:plan_fft,:plan_ifft)
-        f_ = Symbol(string(f, "_"))
+        f_ = Symbol(f, "_")
         @eval begin
             $f_{T,N}(x::$A{T,N}) = invoke($f, Tuple{AbstractArray{T,N}}, x)
             $f_{T,N,R}(x::$A{T,N},r::R) = invoke($f,Tuple{AbstractArray{T,N},R},x,r)