Given any Haskell file, e.g. `Main.hs` such as ```haskell module Main (main) where main :: IO () main = putStrLn $ "Hello " ++ "World!" ``` Some output of `-ddump-timings` is printed to the console: ``` % ghc -ddump-to-file -ddump-timings Main.hs *** Chasing dependencies: Chasing dependencies: alloc=273264 time=0.356 [1 of 1] Compiling Main ( Main.hs, Main.o ) *** Parser [Main]: *** Renamer/typechecker [Main]: *** Desugar [Main]: *** Simplifier [Main]: *** CoreTidy [Main]: *** CorePrep [Main]: *** CodeGen [Main]: Linking Main ... ``` while the rest is correctly redirected to the file: ``` % cat Main.dump-timings Parser [Main]: alloc=112568 time=0.087 Renamer/typechecker [Main]: alloc=15670792 time=41.279 Desugar [Main]: alloc=138992 time=0.225 Simplifier [Main]: alloc=160504 time=0.214 CoreTidy [Main]: alloc=1866272 time=1.556 CorePrep [Main]: alloc=5088 time=0.010 CodeGen [Main]: alloc=1903240 time=2.033 ``` --- Note the ``` *** Chasing dependencies: Chasing dependencies: alloc=273264 time=0.356 ``` which doesn't belong to any module. I'd expect that dumped to own file. --- `-dshow-passes` behaves similarly: ``` % ghc-9.2.0.20210821 -ddump-to-file -dshow-passes Main.hs Glasgow Haskell Compiler, Version 9.2.0.20210821, stage 2 booted by GHC version 8.10.4 *** initializing unit database: Using binary package database: /opt/ghc/9.2.0.20210821/lib/ghc-9.2.0.20210821/package.conf.d/package.cache package flags [] loading package database /opt/ghc/9.2.0.20210821/lib/ghc-9.2.0.20210821/package.conf.d wired-in package ghc-prim mapped to ghc-prim-0.8.0 wired-in package ghc-bignum mapped to ghc-bignum-1.2 wired-in package base mapped to base-4.16.0.0 wired-in package rts mapped to rts wired-in package template-haskell mapped to template-haskell-2.18.0.0 wired-in package ghc mapped to ghc-9.2.0.20210821 !!! initializing unit database: finished in 9.49 milliseconds, allocated 6.197 megabytes *** initializing unit database: package flags [] loading package database /opt/ghc/9.2.0.20210821/lib/ghc-9.2.0.20210821/package.conf.d ... ``` Except it doesn't even create any `Main.show-passes`. This makes debugging GHC performance on bigger projects imposssible. I tested with GHC-8.6.5 and GHC-9.2-rc1, I suspect everything in between is affected as well.