On 6 Aug 2009, at 12:18, Simon Peyton-Jones wrote:
The paper makes the (somewhat radical) case for not generalising
local bindings at all; which would at a stroke remove most of the
issues of the MR. (We'd still need to think about the top level.)
Only the other day I was writing some code that used a case analysis
to build a value I hoped would be polymorphic, and it kept refusing to
type-check. Doing the case analysis on a different part of the value,
then cutting and pasting the branch code multiple times did however
seem to work.
Suddenly I remembered about the difference in generalisation between
let- and lambda- bindings, and could solve the problem by changing the
case to a let! Instantly I could delete the error-prone cut-n-paste
copies, and be more assured of the consistency of my code.
Regards,
Malcolm
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