use metaprogramming in blacklist

Update src/compiler/interface2.jl

fix missing eval

src/compiler/interface2.jl

@@ -33,25 +33,18 @@ chainrules_blacklist(f, args...) = false
 
 # ChainRules does higher-order functions badly
 # see https://github.com/JuliaDiff/ChainRules.jl/issues/122
-chainrules_blacklist(::typeof(map), args...) = true
-chainrules_blacklist(::typeof(broadcast), args...) = true
-chainrules_blacklist(::typeof(mapreduce), args...) = true
-chainrules_blacklist(::typeof(mapfoldl), args...) = true
-chainrules_blacklist(::typeof(mapfoldr), args...) = true
+for f in (map, broadcast, mapreduce, mapfoldl, mapfoldr)
+    @eval chainrules_blacklist(::typeof($f), args...) = true
+end
 chainrules_blacklist(::typeof(sum), f, x::AbstractArray{<:Real}) = true
 # Except for sum(abs2, xs), that is fine
 chainrules_blacklist(::typeof(sum), ::typeof(abs2), x::AbstractArray{<:Real}) = false
 
 # ChainRules current Wirtinger deriviative is not compatible
 # reconsider after https://github.com/JuliaDiff/ChainRulesCore.jl/pull/29
-chainrules_blacklist(::typeof(abs), ::Complex) = true
-chainrules_blacklist(::typeof(abs2), ::Complex) = true
-chainrules_blacklist(::typeof(conj), ::Complex) = true
-chainrules_blacklist(::typeof(adjoint), ::Complex) = true
-chainrules_blacklist(::typeof(hypot), ::Complex) = true
-chainrules_blacklist(::typeof(angle), ::Complex) = true
-chainrules_blacklist(::typeof(imag), ::Complex) = true
-chainrules_blacklist(::typeof(real), ::Complex) = true
+for f in (abs, abs2, conj, adjoint, hypot, angle, imag, real)
+  @eval chainrules_blacklist(::typeof($f), ::Complex) = true
+end
 
 # Sum of nonarrays doesn't really work
 # Fixed in https://github.com/JuliaDiff/ChainRules.jl/pull/124
@@ -66,8 +59,8 @@ Converts a ChainRules pullback into a Zygote pullback.
 `pb` should be a ChainRules pullback, as returned from the second return value of `rrule`
 """==#
 function _pullback_via_chainrules(pb)
-  # The less optimized version of this code is
-  # cback2zback(pb) = (Δs...) -> zextern.(pb(Δs...))
+  # This is the optimized version of
+  # _pullback_via_chainrules(pb) = (Δs...) -> zextern.(pb(Δs...))
   function zback(Δs...)
     ∂s = pb(Δs...)
     ntuple(length(∂s)) do ii