GHCi doesn't honor ':set +c' when loading, for a second time, a file that has .hi/.o
If a file foo.hs
is compiled and has foo.hi
and foo.o
lying around, then the second time foo.hs
is loaded in GHCi (with set +c
set), even with :load *foo.hs
to force interpretation, the file loads fine but the type information is not collected, as if :set +c
wasn't in effect.
This means that commands like :type-at
and :all-types
work as if they had the old file.
I expect that given :set +c
, a successful :load *foo.hs
would always collect the new type information for foo.hs
.
Steps to reproduce
The contents of setc.hs
is the following, although it's pretty surely irrelevant.
module SetC where
The following is a GHCi session showing the problem (my comments are marked with --
).
GHCi, version 8.4.3: http://www.haskell.org/ghc/ :? for help
Prelude> :set +c
-- dir /b is basically ls on Windows
Prelude> :! dir /b setc*
setc.hs
-- When I load a file multiple times it works fine
Prelude> :load *setc.hs
[1 of 1] Compiling SetC ( setc.hs, interpreted )
Ok, one module loaded.
Collecting type info for 1 module(s) ... -- Collected
*SetC> :load *setc.hs
[1 of 1] Compiling SetC ( setc.hs, interpreted )
Ok, one module loaded.
Collecting type info for 1 module(s) ... -- Collected
-- But if I compile it
*SetC> :! ghc -c setc.hs
*SetC> :! dir /b setc*
setc.hi
setc.hs
setc.o
-- The first time the type info is collected
*SetC> :load *setc.hs
[1 of 1] Compiling SetC ( setc.hs, interpreted )
Ok, one module loaded.
Collecting type info for 1 module(s) ... -- Collected
-- But then it is no longer collected
*SetC> :load *setc.hs
[1 of 1] Compiling SetC ( setc.hs, interpreted )
Ok, one module loaded. -- NOT collected!
*SetC>
Then if I change setc.hs
to add some expressions:
module SetC where
x :: Int
x = 1
*SetC> :load *setc.hs
[1 of 1] Compiling SetC ( setc.hs, interpreted )
Ok, one module loaded. -- NOT collected!
-- The new definition is loaded fine
*SetC> x
1
-- But the type information is not there (no output!)
*SetC> :all-types
*SetC>
-- Then if I delete the compiled .hi and .o files
*SetC> :! del setc.hi setc.o
-- ... and load again, :all-types suddenly works
*SetC> :load *setc.hs
[1 of 1] Compiling SetC ( setc.hs, interpreted )
Ok, one module loaded.
Collecting type info for 1 module(s) ... -- Collected
*SetC> :all-types
setc.hs:(4,1)-(4,2): GHC.Types.Int
setc.hs:(4,5)-(4,6): GHC.Types.Int
Trac metadata
Trac field | Value |
---|---|
Version | 8.4.3 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |