style fix

Author: mloubout

src/LinearMaps.jl

@@ -10,7 +10,8 @@ using SparseArrays
 
 import Statistics: mean
 
-import ChainRulesCore: rrule, frule, unthunk, @thunk, NoTangent
+using ChainRulesCore
+import ChainRulesCore: rrule
 
 using Base: require_one_based_indexing
 

src/chainrules.jl

@@ -16,4 +16,4 @@ function rrule(A::LinearMap, x::AbstractVecOrMat)
       return NoTangent(), @thunk(A' * DY)
     end
     return y, pullback
-end
+end

test/rrules.jl

@@ -18,4 +18,4 @@ using Flux, LinearAlgebra
     # Call rule
     g3 = gradient(x -> .5*norm(A'(x))^2, x)
     @test g1 ≈ g3[1]
-end
+end