[Python-ideas] dictionary constructor should not allow duplicate keys

[Michael Selik]

On Wed, May 4, 2016 at 11:19 AM Guido van Rossum <guido at python.org> wrote:

> - In ABC, this was considered, and the rule was that {k1: v1; k2: v2} was
> allowed to have k1==k2 as long as v1==v2. Otherwise it was an error. (But
> ABC did not have comprehensions.)
>

Was that enforced by comparing the expressions or the resulting values?
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