diff --git a/src/indexnotation/analyzers.jl b/src/indexnotation/analyzers.jl
index 26bacd2a..ba143074 100644
--- a/src/indexnotation/analyzers.jl
+++ b/src/indexnotation/analyzers.jl
@@ -118,7 +118,7 @@ function getinputtensorobjects(ex)
             end
             append!(list, list2)
         end
-    elseif isa(ex, Expr) && ex.head in (:for, :function)
+    elseif isa(ex, Expr) && ex.head in (:for, :while)
         append!(list, getinputtensorobjects(ex.args[2]))
     elseif isa(ex, Expr) && ex.head == :call && ex.args[1] == :scalar
         append!(list, gettensorobjects(ex.args[2]))
@@ -142,7 +142,7 @@ function getoutputtensorobjects(ex)
             end
             append!(list, list2)
         end
-    elseif isa(ex, Expr) && ex.head in (:for, :function)
+    elseif isa(ex, Expr) && ex.head in (:for, :while)
         append!(list, getoutputtensorobjects(ex.args[2]))
     end
     return unique!(list)
@@ -159,7 +159,7 @@ function getnewtensorobjects(ex)
         for e in ex.args
             append!(list, getnewtensorobjects(e))
         end
-    elseif isa(ex, Expr) && ex.head in (:for, :function)
+    elseif isa(ex, Expr) && ex.head in (:for, :while)
         append!(list, getnewtensorobjects(ex.args[2]))
     end
     return unique!(list)
diff --git a/src/indexnotation/parser.jl b/src/indexnotation/parser.jl
index 48b54b4a..6c36276a 100644
--- a/src/indexnotation/parser.jl
+++ b/src/indexnotation/parser.jl
@@ -20,6 +20,9 @@ mutable struct TensorParser
 end
 
 function (parser::TensorParser)(ex)
+    if ex isa Expr && ex.head == :function
+        return Expr(:function, ex.args[1], parser(ex.args[2]))
+    end
     for p in parser.preprocessors
         ex = p(ex)
     end
diff --git a/src/indexnotation/preprocessors.jl b/src/indexnotation/preprocessors.jl
index 7f6cd502..f2ee0f29 100644
--- a/src/indexnotation/preprocessors.jl
+++ b/src/indexnotation/preprocessors.jl
@@ -42,6 +42,9 @@ end
 
 # replace all tensor objects by a function of that object
 function replacetensorobjects(f, ex::Expr)
+    # first try to replace ex completely
+    ex2 = f(ex, nothing, nothing)
+    ex2 !== ex && return ex2
     if istensor(ex)
         obj, leftind, rightind = decomposetensor(ex)
         return Expr(ex.head, f(obj, leftind, rightind), ex.args[2:end]...)
@@ -49,7 +52,7 @@ function replacetensorobjects(f, ex::Expr)
         return Expr(ex.head, (replacetensorobjects(f, e) for e in ex.args)...)
     end
 end
-replacetensorobjects(f, ex) = ex
+replacetensorobjects(f, ex) = f(ex, nothing, nothing)
 
 # expandconj: conjugate individual terms or factors instead of a whole expression
 function expandconj(ex::Expr)