Get rid of useless broadcasting

Author: Keno

src/rule_definition_tools.jl

@@ -56,7 +56,7 @@ derivative/setup expressions.
 This macro assumes complex functions are holomorphic. In general, for non-holomorphic
 functions, the `frule` and `rrule` must be defined manually.
 
-If the derivative is one, (e.g. for identity functions) `true` can be used as the most 
+If the derivative is one, (e.g. for identity functions) `true` can be used as the most
 general multiplicative identity.
 
 The `@setup` argument can be elided if no setup code is need. In other
@@ -249,11 +249,11 @@ function propagation_expr(Δs, ∂s, _conj=false, proj=identity)
     summed_∂_mul_Δs = if n∂s > 1
         # Explicit multiplication is only performed for the first pair
         # of partial and gradient.
-        init_expr = :((*).($(_∂s[1]), $(Δs[1])))
+        init_expr = :(*($(_∂s[1]), $(Δs[1])))
 
         # Apply `muladd` iteratively.
         foldl(Iterators.drop(zip(_∂s, Δs), 1); init=init_expr) do ex, (∂s_i, Δs_i)
-            :((muladd).($∂s_i, $Δs_i, $ex))
+            :(muladd($∂s_i, $Δs_i, $ex))
         end
     else
         # Note: we don't want to do broadcasting with only 1 multiply (no `+`),