[GHC] #14624: HEAD panic in ghc:DsForeign: toCType

[GHC]

#14624: HEAD panic in ghc:DsForeign: toCType
-------------------------------------+-------------------------------------
        Reporter:  tianxiaogu        |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.2
      Resolution:                    |             Keywords:
Operating System:  Linux             |         Architecture:  x86_64
 Type of failure:  Compile-time      |  (amd64)
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by RyanGlScott):

 * cc: hvr (added)


Comment:

 That being said, I'm not terribly familiar with what requirements the
 `capi` calling convention imposes on its argument and result types. Is
 there a specification for this somewhere? All I found was
 [https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/ffi-
 chap.html?highlight=capiffi#the-capi-calling-convention this terse
 section] of the users' guide on `CApiFFI`, which doesn't formalize what
 types are accepted, much less what should happen if an //incorrect// type
 is provided, as what appears to be happening here.

 cc'ing hvr, who might have some thoughts on this.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14624#comment:2>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler