diff --git a/TypedSyntax/src/node.jl b/TypedSyntax/src/node.jl
index 0756e5aa..0d7db70f 100644
--- a/TypedSyntax/src/node.jl
+++ b/TypedSyntax/src/node.jl
@@ -30,16 +30,18 @@ function tsn_and_mappings(@nospecialize(f), @nospecialize(t); kwargs...)
     tsn_and_mappings(m, src, rt; kwargs...)
 end
 
-function tsn_and_mappings(m::Method, src::CodeInfo, @nospecialize(rt); warn::Bool=true, strip_macros::Bool=false, kwargs...)
+function tsn_and_mappings(mi::MethodInstance, src::CodeInfo, @nospecialize(rt); warn::Bool=true, strip_macros::Bool=false, kwargs...)
+    m = mi.def::Method
     def = definition(String, m)
     if isnothing(def)
         warn && @warn "couldn't retrieve source of $m"
         return nothing, nothing
     end
-    return tsn_and_mappings(m, src, rt, def...; warn, strip_macros, kwargs...)
+    return tsn_and_mappings(mi, src, rt, def...; warn, strip_macros, kwargs...)
 end
 
-function tsn_and_mappings(m::Method, src::CodeInfo, @nospecialize(rt), sourcetext::AbstractString, lineno::Integer; warn::Bool=true, strip_macros::Bool=false, kwargs...)
+function tsn_and_mappings(mi::MethodInstance, src::CodeInfo, @nospecialize(rt), sourcetext::AbstractString, lineno::Integer; warn::Bool=true, strip_macros::Bool=false, kwargs...)
+    m = mi.def::Method
     filename = isnothing(functionloc(m)[1]) ? string(m.file) : functionloc(m)[1]
     rootnode = JuliaSyntax.parsestmt(SyntaxNode, sourcetext; filename=filename, first_line=lineno, kwargs...)
     if strip_macros
@@ -50,7 +52,7 @@ function tsn_and_mappings(m::Method, src::CodeInfo, @nospecialize(rt), sourcetex
         end
     end
     Δline = lineno - m.line   # offset from original line number (Revise)
-    mappings, symtyps = map_ssas_to_source(src, rootnode, Δline)
+    mappings, symtyps = map_ssas_to_source(src, mi, rootnode, Δline)
     node = TypedSyntaxNode(rootnode, src, mappings, symtyps)
     node.typ = rt
     return node, mappings
@@ -59,9 +61,8 @@ end
 TypedSyntaxNode(@nospecialize(f), @nospecialize(t); kwargs...) = tsn_and_mappings(f, t; kwargs...)[1]
 
 function TypedSyntaxNode(mi::MethodInstance; kwargs...)
-    m = mi.def::Method
     src, rt = getsrc(mi)
-    tsn_and_mappings(m, src, rt; kwargs...)[1]
+    tsn_and_mappings(mi, src, rt; kwargs...)[1]
 end
 
 TypedSyntaxNode(rootnode::SyntaxNode, src::CodeInfo, Δline::Integer=0) =
@@ -397,8 +398,7 @@ end
 # Main logic for mapping `src.code[i]` to node(s) in the SyntaxNode tree
 # Success: when we map it to a unique node
 # Δline is the (Revise) offset of the line number
-function map_ssas_to_source(src::CodeInfo, rootnode::SyntaxNode, Δline::Int)
-    mi = src.parent::MethodInstance
+function map_ssas_to_source(src::CodeInfo, mi::MethodInstance, rootnode::SyntaxNode, Δline::Int)
     slottypes = src.slottypes::Union{Nothing, Vector{Any}}
     have_slottypes = slottypes !== nothing
     ssavaluetypes = src.ssavaluetypes::Vector{Any}
@@ -736,7 +736,7 @@ function map_ssas_to_source(src::CodeInfo, rootnode::SyntaxNode, Δline::Int)
     end
     return mappings, symtyps
 end
-map_ssas_to_source(src::CodeInfo, rootnode::SyntaxNode, Δline::Integer) = map_ssas_to_source(src, rootnode, Int(Δline))
+map_ssas_to_source(src::CodeInfo, mi::MethodInstance, rootnode::SyntaxNode, Δline::Integer) = map_ssas_to_source(src, mi, rootnode, Int(Δline))
 
 function follow_back(src, arg)
     # Follow SSAValue backward to see if it maps back to a slot
diff --git a/TypedSyntax/test/exhaustive.jl b/TypedSyntax/test/exhaustive.jl
index f81c8c3d..dfbc7a6e 100644
--- a/TypedSyntax/test/exhaustive.jl
+++ b/TypedSyntax/test/exhaustive.jl
@@ -26,7 +26,7 @@ const goodmis = Core.MethodInstance[]
                 continue
             end
             try
-                tsn, _ = TypedSyntax.tsn_and_mappings(m, src, rt, ret...; warn=false)
+                tsn, _ = TypedSyntax.tsn_and_mappings(mi, src, rt, ret...; warn=false)
                 @test isa(tsn, TypedSyntaxNode)
                 push!(goodmis, mi)
             catch
diff --git a/src/codeview.jl b/src/codeview.jl
index 45644694..03ffb008 100644
--- a/src/codeview.jl
+++ b/src/codeview.jl
@@ -182,7 +182,6 @@ function cthulhu_typed(io::IO, debuginfo::Symbol,
         # we're working on pre-optimization state, need to ignore `LimitedAccuracy`
         src = copy(src)
         src.ssavaluetypes = mapany(ignorelimited, src.ssavaluetypes::Vector{Any})
-        src.rettype = ignorelimited(src.rettype)
 
         if src.slotnames !== nothing
             slotnames = Base.sourceinfo_slotnames(src)
diff --git a/src/interpreter.jl b/src/interpreter.jl
index efa27aac..b6b796f2 100644
--- a/src/interpreter.jl
+++ b/src/interpreter.jl
@@ -126,10 +126,17 @@ function create_cthulhu_source(@nospecialize(opt), effects::Effects)
     return OptimizedSource(ir, opt.src, opt.src.inlineable, effects)
 end
 
+@static if VERSION ≥ v"1.12.0-DEV.15"
+function CC.transform_result_for_cache(interp::CthulhuInterpreter,
+    linfo::MethodInstance, valid_worlds::WorldRange, result::InferenceResult, can_discard_trees::Bool=false)
+    return create_cthulhu_source(result.src, result.ipo_effects)
+end
+else
 function CC.transform_result_for_cache(interp::CthulhuInterpreter,
     linfo::MethodInstance, valid_worlds::WorldRange, result::InferenceResult)
     return create_cthulhu_source(result.src, result.ipo_effects)
 end
+end
 
 @static if VERSION ≥ v"1.11.0-DEV.879"
 function CC.inlining_policy(interp::CthulhuInterpreter,
@@ -139,6 +146,7 @@ function CC.inlining_policy(interp::CthulhuInterpreter,
             return src.ir
         end
     else
+    	@show typeof(src)
         @assert src isa CC.IRCode || src === nothing "invalid Cthulhu code cache"
         # the default inlining policy may try additional effor to find the source in a local cache
         return @invoke CC.inlining_policy(interp::AbstractInterpreter,
@@ -176,7 +184,7 @@ function CC.IRInterpretationState(interp::CthulhuInterpreter,
     src = inferred.src
     method_info = CC.MethodInfo(src)
     return CC.IRInterpretationState(interp, method_info, ir, mi, argtypes, world,
-                                    src.min_world, src.max_world)
+                                    code.min_world, code.max_world)
 end
 
 @static if VERSION ≥ v"1.11.0-DEV.737"
diff --git a/src/reflection.jl b/src/reflection.jl
index 16ca9b62..33d40fc9 100644
--- a/src/reflection.jl
+++ b/src/reflection.jl
@@ -350,9 +350,8 @@ function add_sourceline!(locs, CI, stmtidx::Int)
 end
 
 function get_typed_sourcetext(mi::MethodInstance, src::CodeInfo, @nospecialize(rt); warn::Bool=true)
-    meth = mi.def::Method
-    tsn, mappings = TypedSyntax.tsn_and_mappings(meth, src, rt; warn, strip_macros=true)
-    return truncate_if_defaultargs!(tsn, mappings, meth)
+    tsn, mappings = TypedSyntax.tsn_and_mappings(mi, src, rt; warn, strip_macros=true)
+    return truncate_if_defaultargs!(tsn, mappings, mi.def::Method)
 end
 
 function get_typed_sourcetext(mi::MethodInstance, ::IRCode, @nospecialize(rt); kwargs...)