Bytecode generator can't handle unboxed tuples (#1257) · Issues · Glasgow Haskell Compiler / GHC

Bytecode generator can't handle unboxed tuples

We need to implement unboxed tuple support in ghci.

For example, with:

f :: a -> b -> (# a, b #)
f x y = (# x, y #)

we get:

$ ghci -v0 -fglasgow-exts w.hs
ghc-6.6: panic! (the 'impossible' happened)
  (GHC version 6.6 for x86_64-unknown-linux):
        Bytecode generator can't handle unboxed tuples.  Possibly due
        to foreign import/export decls in source.  Workaround:
        compile this module to a .o file, then restart session.

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

Trac metadata

Trac field	Value
Version	6.6
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	GHCi
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system	Unknown
Architecture	Unknown

We need to implement unboxed tuple support in ghci.

For example, with:

```
f :: a -> b -> (# a, b #)
f x y = (# x, y #)
```

we get:

```
$ ghci -v0 -fglasgow-exts w.hs
ghc-6.6: panic! (the 'impossible' happened)
  (GHC version 6.6 for x86_64-unknown-linux):
        Bytecode generator can't handle unboxed tuples.  Possibly due
        to foreign import/export decls in source.  Workaround:
        compile this module to a .o file, then restart session.

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
```

<details><summary>Trac metadata</summary>

| Trac field             | Value        |
| ---------------------- | ------------ |
| Version                | 6.6          |
| Type                   | Bug          |
| TypeOfFailure          | OtherFailure |
| Priority               | normal       |
| Resolution             | Unresolved   |
| Component              | GHCi         |
| Test case              |              |
| Differential revisions |              |
| BlockedBy              |              |
| Related                |              |
| Blocking               |              |
| CC                     |              |
| Operating system       | Unknown      |
| Architecture           | Unknown      |

</details>