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

[Michael Day]

> The standard library uses some of the above as function names,
> float.float/1 and string.string/1 for example, and it isn't unusal to
> use them as data constructor names where they wrap the above types.

I use int() and float() all the time as data constructors, very handy.

Michael

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