While it is technically correct to assign to parameters from within method bodies, doing so before the parameter value is read is likely a bug. Instead, initial values of parameters should be, if not treated as ``++readonly++`` then at least read before reassignment.

== Noncompliant Code Example

----
Module Module1
    Sub Foo(ByVal a As Integer)
        a = 42                  ' Noncompliant
    End Sub
End Module
----

== Compliant Solution

----
Module Module1
    Sub Foo(ByVal a As Integer)
        Dim tmp = a
        tmp = 42
    End Sub
End Module
----

== Exceptions

``++ByRef++`` parameters are ignored.

----
Module Module1
    Sub Foo(ByRef a As Integer)
        a = 42                  ' Ignored; it is a ByRef parameter
    End Sub
End Module
----