CI fix

Author: FedeClaudi

src/printing.jl

@@ -282,7 +282,7 @@ Get the string result of calling [`print_tree`](@ref) with the supplied argument
 The `context` argument works as it does in `Base.repr`.
 """
 repr_tree(tree; context=nothing, kw...) = repr_tree(printnode, print_child_key, tree; context=nothing, kw...)
-function repr_tree(f, g, tree; context=nothing, kw...)
+function repr_tree(f::Function, g::Function, tree; context=nothing, kw...)
     buf = IOBuffer()
     io = context === nothing ? buf : IOContext(buf, context)
     print_tree(f, g, io, tree; kw...)

test/printing.jl

@@ -190,14 +190,10 @@ end
                    """)
 
     # Test printnode override
-    str = repr_tree(tree) do io, s
-        if s isa BoxNode
-            print(io, s.s)
-        else
-            AbstractTrees.printnode(io, s)
-        end
-    end
+    _f(io, s) = s isa BoxNode ? print(io, s.s) : AbstractTrees.printnode(io, s)
+    _g(io, k) = AbstractTrees.print_child_key(io, k)
 
+    str = repr_tree(_f, _g, tree) 
     @test endswith(str, """
                    ├─ "foo"
                    ├─ bar