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

[Julien Fischer]

On Tue, 17 May 2016, Mark Brown wrote:

> Here's my views on the proposed keywords.
>
> On Mon, May 16, 2016 at 10:13 AM, Zoltan Somogyi
> <zoltan.somogyi at runbox.com> wrote:

>> +    ; Name = "=<"                   % inst ctor

>> +    ; Name = ">>"                   % mode ctor

These two still need to be useable as predicate and function names in
user code respectively, as any module that defines a numeric type is
going to want to use them (integer-like type in the second case).
The standard library as well as a bunch of modules in extras do this.

Julien.