Fix bugs for x^Val and add tests

base/gmp.jl

@@ -443,9 +443,6 @@ end
 ^(x::Integer, y::BigInt ) = bigint_pow(BigInt(x), y)
 ^(x::Bool   , y::BigInt ) = Base.power_by_squaring(x, y)
 
-# override default inlining of x^2 and x^3 etc.
-^{p}(x::BigInt, ::Type{Val{p}}) = x^p
-
 function powermod(x::BigInt, p::BigInt, m::BigInt)
     r = BigInt()
     ccall((:__gmpz_powm, :libgmp), Void,

base/irrationals.jl

@@ -212,7 +212,6 @@ catalan
 for T in (Irrational, Rational, Integer, Number)
     ^(::Irrational{:e}, x::T) = exp(x)
 end
-^{p}(::Irrational{:e}, ::Type{Val{p}}) = exp(p)
 
 log(::Irrational{:e}) = 1 # use 1 to correctly promote expressions like log(x)/log(e)
 log(::Irrational{:e}, x::Number) = log(x)

base/math.jl

@@ -698,7 +698,7 @@ end
 @inline ^(x::Float64, y::Integer) = x ^ Float64(y)
 @inline ^(x::Float32, y::Integer) = x ^ Float32(y)
 @inline ^(x::Float16, y::Integer) = Float16(Float32(x) ^ Float32(y))
-@inline ^{p}(x::Float16, ::Type{Val{p}}) = Float16(Float32(x) ^ Val{p})
+@inline literal_pow{p}(::typeof(^), x::Float16, ::Type{Val{p}}) = Float16(literal_pow(^,Float32(x),Val{p}))
 
 function angle_restrict_symm(theta)
     const P1 = 4 * 7.8539812564849853515625e-01

base/mpfr.jl

@@ -504,9 +504,6 @@ end
 ^(x::BigFloat, y::Integer)  = typemin(Clong)  <= y <= typemax(Clong)  ? x^Clong(y)  : x^BigInt(y)
 ^(x::BigFloat, y::Unsigned) = typemin(Culong) <= y <= typemax(Culong) ? x^Culong(y) : x^BigInt(y)
 
-# override default inlining of x^2 etc.
-^{p}(x::BigFloat, ::Type{Val{p}}) = x^p
-
 for f in (:exp, :exp2, :exp10, :expm1, :cosh, :sinh, :tanh, :sech, :csch, :coth, :cbrt)
     @eval function $f(x::BigFloat)
         z = BigFloat()

test/float16.jl

@@ -61,6 +61,7 @@ g = Float16(1.)
 @test f*g === Float16(2f0)
 @test f/g === Float16(2f0)
 @test f^g === Float16(2f0)
+@test f^1 === Float16(2f0)
 @test f^-g === Float16(0.5f0)
 
 @test f + 2 === Float16(4f0)

test/math.jl

@@ -128,6 +128,7 @@ end
         yi = 4
         @testset "Random values" begin
             @test x^y ≈ big(x)^big(y)
+            @test x^1 === x
             @test x^yi ≈ big(x)^yi
             @test acos(x) ≈ acos(big(x))
             @test acosh(1+x) ≈ acosh(big(1+x))