failed to build

[joshsh]

The "impossible" happened during running of etlas build on a project with a dependency on websockets version 0.12.5.2:

Failed to build websockets-0.12.5.2.
Build log (
/Users/joshsh/.etlas/logs/eta-0.8.6.2/websockets-0.12.5.2-d81ce3cdee3ab87c74dfbc8eac0d043f6d0a6947ee1d4de19e968119da4b419c.log
):
Configuring library for websockets-0.12.5.2..
Preprocessing library for websockets-0.12.5.2..
Building library for websockets-0.12.5.2..
[ 1 of 16] Compiling Network.WebSockets.Connection.Options
src/Network/WebSockets/Connection/Options.hs:18:1: warning: [-Wunused-imports (in -Wextra)]
    The import of ‘Data.Monoid’ is redundant
      except perhaps to import instances from ‘Data.Monoid’
    To import instances alone, use: import Data.Monoid()
   |
18 | import           Data.Monoid (Monoid (..))
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[ 2 of 16] Compiling Network.WebSockets.Extensions.Description
src/Network/WebSockets/Extensions/Description.hs:13:1: warning: [-Wunused-imports (in -Wextra)]
    The import of ‘Control.Applicative’ is redundant
      except perhaps to import instances from ‘Control.Applicative’
    To import instances alone, use: import Control.Applicative()
   |
13 | import           Control.Applicative              ((*>), (<*))
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

src/Network/WebSockets/Extensions/Description.hs:17:1: warning: [-Wunused-imports (in -Wextra)]
    The import of ‘Data.Monoid’ is redundant
      except perhaps to import instances from ‘Data.Monoid’
    To import instances alone, use: import Data.Monoid()
   |
17 | import           Data.Monoid                      (mconcat, mappend)
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[ 3 of 16] Compiling Network.WebSockets.Http
src/Network/WebSockets/Http.hs:36:1: warning: [-Wunused-imports (in -Wextra)]
    The import of ‘Control.Applicative’ is redundant
      except perhaps to import instances from ‘Control.Applicative’
    To import instances alone, use: import Control.Applicative()
   |
36 | import           Control.Applicative                       (pure, (*>), (<$>),
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^...

src/Network/WebSockets/Http.hs:47:1: warning: [-Wunused-imports (in -Wextra)]
    The import of ‘Data.Monoid’ is redundant
      except perhaps to import instances from ‘Data.Monoid’
    To import instances alone, use: import Data.Monoid()
   |
47 | import           Data.Monoid                               (mappend, mconcat)
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[ 4 of 16] Compiling Network.WebSockets.Hybi13.Masketa: panic! (the 'impossible' happened)
  (Eta version 0.8.6b2):
    tcCheckFIType: Unsupported calling convention.
  ccall unsafe "value _hs_mask_chunk"

Please report this as a Eta bug: http://github.com/typelead/eta/issues

etlas: Failed to build websockets-0.12.5.2 (which is required by u2-0.1). See
the build log above for details.

Note:

$ etlas --version
etlas version 1.5.1.0
compiled using version 2.1.0.0 of the etlas-cabal library 

[jneira]

Hi, the last version patched for eta is 0.12.5.1, so we should patch the new version. In the meanwhile, if possible, pinning the version to that one should make the build work

[jneira]

@joshsh once https://github.com/typelead/eta-hackage/pull/126 is merged, an etlas update && etlas clean && etlas build should work

[jneira]

merged!

[jneira]

@joshsh this one should be resolved, feel free to reopen if it persists after an etlas update