test(meta): filter LoweredCodeUtils' benign JET-scan warnings

Project.toml

@@ -32,6 +32,7 @@ DifferentiationInterface = "a0c0ee7d-e4b9-4e03-894e-1c5f64a51d63"
 Documenter = "e30172f5-a6a5-5a46-863b-614d45cd2de4"
 ForwardDiff = "f6369f11-7733-5829-9624-2563aa707210"
 JET = "c3a54625-cd67-489e-a8e7-0a5a0ff4e31b"
+Logging = "56ddb016-857b-54e1-b83d-db4d58db5568"
 Markdown = "d6f4376e-aef5-505a-96c1-9c027394607a"
 MarkdownAST = "d0879d2d-cac2-40c8-9cee-1863dc0c7391"
 Plots = "91a5bcdd-55d7-5caf-9e0b-520d859cae80"
@@ -46,6 +47,7 @@ test = [
     "Documenter",
     "ForwardDiff",
     "JET",
+    "Logging",
     "Markdown",
     "MarkdownAST",
     "Plots",
@@ -62,6 +64,7 @@ DocStringExtensions = "0.9"
 Documenter = "1"
 ForwardDiff = "0.10, 1"
 JET = "0.11"
+Logging = "1"
 Markdown = "1"
 MarkdownAST = "0.1"
 Plots = "1"

test/suite/meta/test_code_quality.jl

@@ -4,10 +4,57 @@ using Test: Test
 using Aqua: Aqua
 using JET: JET
 using CTBase: CTBase
+using Logging: Logging
 
 const VERBOSE = isdefined(Main, :TestData) ? Main.TestData.VERBOSE : true
 const SHOWTIMING = isdefined(Main, :TestData) ? Main.TestData.SHOWTIMING : true
 
+# ==============================================================================
+# Filter LoweredCodeUtils' benign "skipping callee ... UndefRefError()" warnings
+# ==============================================================================
+#
+# JET.test_package collects method signatures via Revise/LoweredCodeUtils without
+# calling anything. For keyword-argument functor methods (a callable struct with a
+# `; kwarg=default` in its call signature), Julia compiles a hidden body function
+# named `var"#_#N"`; LoweredCodeUtils cannot statically attribute that hidden body
+# to its parent method and emits a `@warn "skipping callee ..." ` before moving on.
+# It is a collector limitation, not a JET finding — the flagged body is simply
+# excluded from the static scan; everything else (including its runtime behavior,
+# covered by the normal test suite) is unaffected.
+#
+# Filtered precisely by message prefix + emitting module, so any other, unrelated
+# warning from LoweredCodeUtils still surfaces normally.
+struct _SkipBenignLoweredCodeUtilsWarnings <: Logging.AbstractLogger
+    logger::Logging.AbstractLogger
+end
+
+Logging.min_enabled_level(l::_SkipBenignLoweredCodeUtilsWarnings) =
+    Logging.min_enabled_level(l.logger)
+
+Logging.shouldlog(l::_SkipBenignLoweredCodeUtilsWarnings, level, _module, group, id) =
+    Logging.shouldlog(l.logger, level, _module, group, id)
+
+function Logging.handle_message(
+    l::_SkipBenignLoweredCodeUtilsWarnings,
+    level,
+    message,
+    _module,
+    group,
+    id,
+    file,
+    line;
+    kwargs...,
+)
+    if level == Logging.Warn &&
+        nameof(_module) === :LoweredCodeUtils &&
+        startswith(string(message), "skipping callee")
+        return nothing
+    end
+    return Logging.handle_message(
+        l.logger, level, message, _module, group, id, file, line; kwargs...
+    )
+end
+
 function test_code_quality()
     Test.@testset verbose = VERBOSE showtiming = SHOWTIMING "Code quality" begin
         Test.@testset verbose = VERBOSE showtiming = SHOWTIMING "Aqua" begin
@@ -23,7 +70,11 @@ function test_code_quality()
         end
 
         Test.@testset "JET" begin
-            JET.test_package(CTBase; target_modules=(CTBase,))
+            Logging.with_logger(
+                _SkipBenignLoweredCodeUtilsWarnings(Logging.current_logger())
+            ) do
+                JET.test_package(CTBase; target_modules=(CTBase,))
+            end
         end
 
         # Test.@testset "JuliaFormatter" begin