macro deffoo()
    sig = GlobalRef(__module__, :foo)
    quote
        $sig(args...) = length(args) + 2
    end
end

@deffoo
@show foo(1,2,3)

julia> using Revise; includet("mre.jl")
foo(1, 2, 3) = 5
ERROR: TypeError: in typeassert, expected Symbol, got a value of type QuoteNode
Stacktrace:
 [1] includet(mod::Module, file::String)
   @ Revise ~/julia/packages/Revise/src/packagedef.jl:1011
 [2] includet(file::String)
   @ Revise ~/julia/packages/Revise/src/packagedef.jl:1016
 [3] top-level scope
   @ REPL[2]:1

caused by: TypeError: in typeassert, expected Symbol, got a value of type QuoteNode
Stacktrace:
 [1] identify_framemethod_calls(frame::JuliaInterpreter.Frame)
   @ LoweredCodeUtils ~/julia/packages/LoweredCodeUtils/src/signatures.jl:155
 [2] rename_framemethods!
   @ ~/julia/packages/LoweredCodeUtils/src/signatures.jl:294 [inlined]
 [3] methods_by_execution!(recurse::Any, methodinfo::Revise.CodeTrackingMethodInfo, docexprs::Dict{Module, Vector{Expr}}, mod::Module, ex::Expr; mode::Symbol, disablebp::Bool, always_rethrow::Bool, kwargs::Base.Pairs{Symbol, Bool, Tuple{Symbol}, NamedTuple{(:skip_include,), Tuple{Bool}}})
   @ Revise ~/julia/packages/Revise/src/lowered.jl:191
 [4] #eval_with_signatures#92
   @ ~/julia/packages/Revise/src/packagedef.jl:463 [inlined]
 [5] instantiate_sigs!(modexsigs::OrderedCollections.OrderedDict{Module, OrderedCollections.OrderedDict{Revise.RelocatableExpr, Union{Nothing, Vector{Any}}}}; mode::Symbol, kwargs::Base.Pairs{Symbol, Bool, Tuple{Symbol}, NamedTuple{(:skip_include,), Tuple{Bool}}})
   @ Revise ~/julia/packages/Revise/src/packagedef.jl:471
 [6] track(mod::Module, file::String; mode::Symbol, kwargs::Base.Pairs{Symbol, Bool, Tuple{Symbol}, NamedTuple{(:skip_include,), Tuple{Bool}}})
   @ Revise ~/julia/packages/Revise/src/packagedef.jl:899
 [7] includet(mod::Module, file::String)
   @ Revise ~/julia/packages/Revise/src/packagedef.jl:994
 [8] includet(file::String)
   @ Revise ~/julia/packages/Revise/src/packagedef.jl:1016
 [9] top-level scope
   @ REPL[2]:1