make mul! inline for IdentityOperator

Author: albertomercurio

src/basic.jl

@@ -44,7 +44,8 @@ for op in (:*, :\)
     end
 end
 
-function LinearAlgebra.mul!(v::AbstractVecOrMat, ii::IdentityOperator, u::AbstractVecOrMat)
+@inline function LinearAlgebra.mul!(
+        v::AbstractVecOrMat, ii::IdentityOperator, u::AbstractVecOrMat)
     @assert size(u, 1) == ii.len
     copy!(v, u)
 end