Annotations not written to interface files

Small example:

module C where

data T a = T a

Compile it:

newbie:tests rl$ ~/projects/ndp/ghc/inplace/bin/ghc-stage2 -O2 -c C.hs
newbie:tests rl$ ls -l C.hi
-rw-r--r--  1 rl  rl  485  4 Dec 12:53 C.hi

Add an annotation: {-# ANN type T () #-}. Compile:

newbie:tests rl$ ~/projects/ndp/ghc/inplace/bin/ghc-stage2 -O2 -c C.hs
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
Loading package ffi-1.0 ... linking ... done.
newbie:tests rl$ ls -l C.hi
-rw-r--r--  1 rl  rl  485  4 Dec 12:53 C.hi

Note that the interface file hasn't been updated. Remove C.hi and recompile:

newbie:tests rl$ rm C.hi
newbie:tests rl$ ~/projects/ndp/ghc/inplace/bin/ghc-stage2 -O2 -c C.hs
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
Loading package ffi-1.0 ... linking ... done.
newbie:tests rl$ ls -l C.hi
-rw-r--r--  1 rl  rl  507  4 Dec 12:54 C.hi

Only now has the annotation been written to C.hi.

Trac metadata

Trac field	Value
Version	6.13
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
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