Update stdlib/REPL/src/REPL.jl

Co-authored-by: Jameson Nash <vtjnash@gmail.com>

Author: KristofferC

stdlib/REPL/src/REPL.jl

@@ -1853,7 +1853,7 @@ function out_transform(@nospecialize(x), n::Ref{Int})
     end)
 end
 
-function get_usings!(usings, ex)
+function get_usings!(usings, @nospecialize(ex))
     ex isa Expr || return usings
     # get all `using` and `import` statements which are at the top level
     for i in 1:length(ex.args)