diff --git a/src/stage1/recurse.jl b/src/stage1/recurse.jl
index fef5c751..2d65f71f 100644
--- a/src/stage1/recurse.jl
+++ b/src/stage1/recurse.jl
@@ -273,10 +273,16 @@ function optic_transform!(ci, mi, nargs, N)
     # SSA conversion
     meth = mi.def::Method
     domtree = construct_domtree(ir.cfg.blocks)
-    stmts = VERSION < v"1.11.0-DEV.258" ? ir.stmts.inst : ir.stmts.stmt
+    stmts = @static VERSION < v"1.11.0-DEV.258" ? ir.stmts.inst : ir.stmts.stmt
     defuse_insts = scan_slot_def_use(Int(meth.nargs), ci, stmts)
     ci.ssavaluetypes = Any[Any for i = 1:ci.ssavaluetypes]
-    ir = construct_ssa!(ci, ir, domtree, defuse_insts, ci.slottypes, SimpleInferenceLattice.instance)
+    @static if VERSION > v"1.11.0-DEV.337"
+        interp = NativeInterpreter() # dummy interpreter (not used by `construct_ssa!`)
+        opt_state=OptimizationState(mi, ci, interp)
+        ir = construct_ssa!(ci, ir, opt_state, domtree, defuse_insts, SimpleInferenceLattice.instance)
+    else
+        ir = construct_ssa!(ci, ir, domtree, defuse_insts, ci.slottypes, SimpleInferenceLattice.instance)
+    end
     ir = compact!(ir)
 
     nfixedargs = Int(meth.nargs)
diff --git a/src/stage2/abstractinterpret.jl b/src/stage2/abstractinterpret.jl
index c655a19b..926a53e9 100644
--- a/src/stage2/abstractinterpret.jl
+++ b/src/stage2/abstractinterpret.jl
@@ -1,13 +1,13 @@
-import Core.Compiler: abstract_call_gf_by_type, abstract_call
-using Core.Compiler: Const, isconstType, argtypes_to_type, tuple_tfunc, Const,
-    getfield_tfunc, _methods_by_ftype, VarTable, cache_lookup, nfields_tfunc,
+import .CC: abstract_call_gf_by_type, abstract_call_opaque_closure
+using .CC: Const, isconstType, argtypes_to_type, tuple_tfunc, Const,
+    getfield_tfunc, _methods_by_ftype, VarTable, nfields_tfunc,
     ArgInfo, singleton_type, CallMeta, MethodMatchInfo, specialize_method,
     PartialOpaque, UnionSplitApplyCallInfo, typeof_tfunc, apply_type_tfunc, instanceof_tfunc,
     StmtInfo
 using Core: PartialStruct
 using Base.Meta
 
-function Core.Compiler.abstract_call_gf_by_type(interp::ADInterpreter, @nospecialize(f),
+function CC.abstract_call_gf_by_type(interp::ADInterpreter, @nospecialize(f),
         arginfo::ArgInfo, si::StmtInfo, @nospecialize(atype), sv::InferenceState, max_methods::Int)
     (;argtypes) = arginfo
     if interp.backward
@@ -25,7 +25,7 @@ function Core.Compiler.abstract_call_gf_by_type(interp::ADInterpreter, @nospecia
                 mi = specialize_method(call.info.results.matches[1], preexisting=true)
                 ci = get(rinterp.unopt[rinterp.current_level], mi, nothing)
                 clos = AbstractCompClosure(rinterp.current_level, 1, call.info, ci.stmt_info)
-                clos = Core.PartialOpaque(Core.OpaqueClosure{<:Tuple, <:Any}, nothing, sv.linfo, clos)
+                clos = PartialOpaque(Core.OpaqueClosure{<:Tuple, <:Any}, nothing, sv.linfo, clos)
             elseif isa(call.info, RRuleInfo)
                 if rinterp.current_level == 1
                     clos = getfield_tfunc(call.info.rrule_rt, Const(2))
@@ -550,7 +550,7 @@ function infer_prim_closure(interp::ADInterpreter, pc::PrimClosure, @nospecializ
     error()
 end
 
-function Core.Compiler.abstract_call_opaque_closure(interp::ADInterpreter,
+function CC.abstract_call_opaque_closure(interp::ADInterpreter,
     closure::PartialOpaque, arginfo::ArgInfo, sv::InferenceState, check::Bool=true)
 
     if isa(closure.source, AbstractCompClosure)
@@ -565,8 +565,6 @@ function Core.Compiler.abstract_call_opaque_closure(interp::ADInterpreter,
         return infer_prim_closure(interp, closure.source, argtypes[2], sv)
     end
 
-    rt = invoke(Core.Compiler.abstract_call_opaque_closure, Tuple{AbstractInterpreter, PartialOpaque, ArgInfo, InferenceState, Bool},
-        interp, closure, arginfo, sv, check)
-
-    return rt
+    return @invoke CC.abstract_call_opaque_closure(interp::AbstractInterpreter,
+        closure::PartialOpaque, arginfo::ArgInfo, sv::InferenceState, check::Bool)
 end
diff --git a/src/stage2/interpreter.jl b/src/stage2/interpreter.jl
index e4fd5eda..0a9d995a 100644
--- a/src/stage2/interpreter.jl
+++ b/src/stage2/interpreter.jl
@@ -260,10 +260,6 @@ CC.get_inference_cache(ei::ADInterpreter) = get_inference_cache(ei.native_interp
 CC.lock_mi_inference(ei::ADInterpreter, mi::MethodInstance) = nothing
 CC.unlock_mi_inference(ei::ADInterpreter, mi::MethodInstance) = nothing
 
-struct CodeInfoView
-    d::Dict{MethodInstance, Any}
-end
-
 function CC.code_cache(ei::ADInterpreter)
     while ei.current_level > lastindex(ei.opt)
         push!(ei.opt, Dict{MethodInstance, Any}())
@@ -273,16 +269,6 @@ end
 CC.may_optimize(ei::ADInterpreter) = true
 CC.may_compress(ei::ADInterpreter) = false
 CC.may_discard_trees(ei::ADInterpreter) = false
-function CC.get(view::CodeInfoView, mi::MethodInstance, default)
-    r = get(view.d, mi, nothing)
-    if r === nothing
-        return default
-    end
-    if isa(r, OptimizationState)
-        r = r.src
-    end
-    return r::CodeInfo
-end
 
 function CC.add_remark!(interp::ADInterpreter, sv::InferenceState, msg)
     key = CC.any(sv.result.overridden_by_const) ? sv.result : sv.linfo
@@ -365,11 +351,17 @@ function CC.optimize(interp::ADInterpreter, opt::OptimizationState,
 end
 =#
 
-function CC.finish!(interp::ADInterpreter, caller::InferenceResult)
+function _finish!(caller::InferenceResult)
     effects = caller.ipo_effects
     caller.src = Cthulhu.create_cthulhu_source(caller.src, effects)
 end
 
+@static if VERSION ≥ v"1.11.0-DEV.737"
+CC.finish!(::ADInterpreter, caller::InferenceState) = _finish!(caller.result)
+else
+CC.finish!(::ADInterpreter, caller::InferenceResult) = _finish!(caller)
+end
+
 function ir2codeinst(ir::IRCode, inst::CodeInstance, ci::CodeInfo)
     CodeInstance(inst.def, inst.rettype, isdefined(inst, :rettype_const) ? inst.rettype_const : nothing,
                  Cthulhu.OptimizedSource(CC.copy(ir), ci, inst.inferred.isinlineable, CC.decode_effects(inst.purity_bits)),