Remove dead code

Author: penelopeysm

src/context_implementations.jl

@@ -1,19 +1,8 @@
 using Distributions:
     UnivariateDistribution, MultivariateDistribution, MatrixDistribution, Distribution
 
-const AMBIGUITY_MSG =
-    "Ambiguous `LHS .~ RHS` or `@. LHS ~ RHS` syntax. The broadcasting " *
-    "can either be column-wise following the convention of Distributions.jl or " *
-    "element-wise following Julia's general broadcasting semantics. Please make sure " *
-    "that the element type of `LHS` is not a supertype of the support type of " *
-    "`AbstractVector` to eliminate ambiguity."
-
 alg_str(spl::Sampler) = string(nameof(typeof(spl.alg)))
 
-# utility funcs for querying sampler information
-require_gradient(spl::Sampler) = false
-require_particles(spl::Sampler) = false
-
 # Allows samplers, etc. to hook into the final logp accumulation in the tilde-pipeline.
 function acclogp_assume!!(context::AbstractContext, vi::AbstractVarInfo, logp)
     return acclogp_assume!!(NodeTrait(acclogp_assume!!, context), context, vi, logp)