Fix a bug in mk_superclasses_of
authorSimon Peyton Jones <simonpj@microsoft.com>
Tue, 25 Oct 2016 14:22:17 +0000 (15:22 +0100)
committerSimon Peyton Jones <simonpj@microsoft.com>
Fri, 25 Nov 2016 08:33:31 +0000 (08:33 +0000)
commit0476a64e70c91b326b53db2fc55adbbaa8e5c270
tree20a048aa5df05baa8eda03e084426da8e2095c7e
parent9a431e5116c132f08f8296c6e8fbbbe7ba7a20b6
Fix a bug in mk_superclasses_of

This bug meant that we were less eager about expanding
tuple superclasses than we should have been; i.e. we stopped
too soon.  That's not fatal, beause we expand more superclasses
later, but it's less efficient.
compiler/typecheck/TcCanonical.hs