Idea: In the next edition, stop accepting `0.` as a valid float literal

[RustyYato]

@jethrogb

Except in the most annoying case of tuple_tuple_struct.0.0 which still won't be legal.

I think we could make that legal, by making it mean the same thing as (tuple_tuple_struct.0).0 but that is a different discussion.

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link to other thread that I just made for this:

Should we make `nested_tuple.0.0` legal syntax?

Currently nested_tuple.0.0 is not legal and gives the following error error: unexpected token: `0.0` --> src/lib.rs:2:19 | 2 | let x = nested_tuple.0.0; | ------^^^ | | | | | unexpected token | help: try parenthesizing the first index: `(tuple.0).0` error: aborting due to previous error error: Could not compile `playground`. To learn more, run the command again with --verbose. Could we change this behavior to parse it as…