[commit: ghc] master: Remove panics for TcTyCon (0c9d9de)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/0c9d9dec0a924a4f34f4cff26d004143c028861a/ghc

>---------------------------------------------------------------

commit 0c9d9dec0a924a4f34f4cff26d004143c028861a
Author: Simon Peyton Jones <simonpj at microsoft.com>
Date:   Tue Feb 21 14:34:50 2017 +0000

    Remove panics for TcTyCon
    
    Previously TcTyCons were used only for knot-tying, but now they
    are also used after an error, to add a benign TyCon to the envt
    so we can carry on; see TyCon.makeRecoveryTyCon.  But since it
    is used in this way, subsequent declarations may see a TcTyCon
    (e.g. during injectivity checks) and should not have a heart attack
    as a result.
    
    See Note [TcTyCon] in TyCon.
    
    This fixes Trac #13271


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0c9d9dec0a924a4f34f4cff26d004143c028861a
 compiler/typecheck/TcTyClsDecls.hs |   4 +-
 compiler/types/TyCon.hs            | 103 ++++++++++++++++++++-----------------
 2 files changed, 57 insertions(+), 50 deletions(-)

Diff suppressed because of size. To see it, use:

    git diff-tree --root --patch-with-stat --no-color --find-copies-harder --ignore-space-at-eol --cc 0c9d9dec0a924a4f34f4cff26d004143c028861a