Prevent spurious error hints (#164)

Author: penelopeysm

Project.toml

@@ -3,7 +3,7 @@ uuid = "80f14c24-f653-4e6a-9b94-39d6b0f70001"
 keywords = ["markov chain monte carlo", "probabilistic programming"]
 license = "MIT"
 desc = "A lightweight interface for common MCMC methods."
-version = "5.6.2"
+version = "5.6.3"
 
 [deps]
 BangBang = "198e06fe-97b7-11e9-32a5-e1d131e6ad66"

src/AbstractMCMC.jl

@@ -123,8 +123,11 @@ include("logdensityproblems.jl")
 if isdefined(Base.Experimental, :register_error_hint)
     function __init__()
         Base.Experimental.register_error_hint(MethodError) do io, exc, argtypes, _
-            if Base.parentmodule(exc.f) == LogDensityProblems &&
-                any(a -> a <: LogDensityModel, argtypes)
+            if (
+                any(a -> a <: LogDensityModel, argtypes) &&
+                exc.f isa Function &&
+                Base.parentmodule(exc.f) == LogDensityProblems
+            )
                 print(
                     io,
                     "\n`AbstractMCMC.LogDensityModel` is a wrapper and does not itself implement the LogDensityProblems.jl interface. To use LogDensityProblems.jl methods, access the inner type with (e.g.) `logdensity(model.logdensity, params)` instead of `logdensity(model, params)`.",