[m-rev.] for review: better error messages for lambda exprs

[Peter Wang]

On Wed, 18 May 2016 04:22:40 +1000 (AEST), "Zoltan Somogyi" <zoltan.somogyi at runbox.com> wrote:
> 
> Are there any objections to commiting the changes
> to the parsing of the lambda expressions only,
> without the changes to the parsing of @, ^, := etc?

Not from me.

Peter