sometimes when doing release builds with the new 5.9 toolchain, i get some debug-ish compiler output that looks like:
Looking for a function: $s5MongoAAO0A6DriverE7SessionC3run7command7against2on2by4withq_x_8DatabaseQzAbCE14ReadPreferenceOs15ContinuousClockV7InstantVSgq_AbCE6CursorVy_7ElementQzGYaKXEtYaKAC0A15IterableCommandRzr0_lFAB0A7LibraryE4FindVy_AVy_8UnidocDB13PackageRecordVGG_ytTg5
Expected type: @convention(method) @async (@guaranteed Mongo.Find<Mongo.Cursor<PackageRecord>>, @guaranteed Mongo.Database, @guaranteed Mongo.ReadPreference, @in_guaranteed Optional<ContinuousClock.Instant>, @guaranteed @noescape @async @callee_guaranteed @substituted <τ_0_0, τ_0_1 where τ_0_0 : BSONDecodable, τ_0_0 : Sendable> (@guaranteed Mongo.Cursor<τ_0_0>) -> (@out τ_0_1, @error Error) for <PackageRecord, ()>, @guaranteed Mongo.Session) -> (@out (), @error Error)
Found type: @convention(method) @async (@guaranteed Mongo.Find<Mongo.Cursor<PackageRecord>>, @guaranteed Mongo.Database, @guaranteed Mongo.ReadPreference, @in_guaranteed Optional<ContinuousClock.Instant>, @guaranteed @noescape @async @callee_guaranteed @substituted <τ_0_0, τ_0_1 where τ_0_0 : BSONDecodable, τ_0_0 : Sendable> (@guaranteed Mongo.Cursor<τ_0_0>) -> (@out τ_0_1, @error Error) for <PackageRecord, ()>, @guaranteed Mongo.Session) -> (@out (), @error Error)
Looking for a function: $s5MongoAAO0A7LibraryE4FindVACs5NeverOSg6StrideRtzAG7TailingRtzrlE_11readConcern5limit4skip4withAEy_xGAB0A6SchemaE10CollectionV_AB0A6DriverE04ReadH0OSgS2iSgyAQzKXEtKcfCAbCE11SingleBatchOy_8UnidocDB13PackageRecordVG_Tg5
Expected type: @convention(method) (@owned Mongo.Collection, Optional<Mongo.ReadConcern>, Int, Optional<Int>, @guaranteed @noescape @callee_guaranteed @substituted <τ_0_0 where τ_0_0 : MongoReadEffect> (@inout Mongo.Find<τ_0_0>) -> @error Error for <Mongo.SingleBatch<PackageRecord>>, @thin Mongo.Find<Mongo.SingleBatch<PackageRecord>>.Type) -> (@owned Mongo.Find<Mongo.SingleBatch<PackageRecord>>, @error Error)
Found type: @convention(method) (@owned Mongo.Collection, Optional<Mongo.ReadConcern>, Int, Optional<Int>, @guaranteed @noescape @callee_guaranteed @substituted <τ_0_0 where τ_0_0 : MongoReadEffect> (@inout Mongo.Find<τ_0_0>) -> @error Error for <Mongo.SingleBatch<PackageRecord>>, @thin Mongo.Find<Mongo.SingleBatch<PackageRecord>>.Type) -> (@owned Mongo.Find<Mongo.SingleBatch<PackageRecord>>, @error Error)
what does this output mean, and are we supposed to be seeing it?
tshortli
(Allan Shortlidge)
2
Appears to be coming from the GenericsSpecializer in the SIL optimization pipeline. The fact that you're seeing this output is indicative of a condition that would cause an assertion failure with an asserts build of the compiler so I think this is worth filing a GitHub issue about. Is the project you're building something that a compiler engineer would be able to try building?
the project, swift-unidoc, is open source, and the message has been showing up in CI logs for the past few commits or so.
