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Allow record's parameter_list to be empty. (#3900)

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* Allow record's `parameter_list` to be empty.

Based on https://github.com/dotnet/csharplang/blob/master/meetings/2020/LDM-2020-08-24.md#base-calls-on-parameterless-records
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AlekseyTs 2020-09-18 10:13:26 -07:00 committed by GitHub
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proposals/csharp-9.0/records.md
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@ -27,7 +27,6 @@ record_body
Record types are reference types, similar to a class declaration. It is an error for a record to provide
a `record_base` `argument_list` if the `record_declaration` does not contain a `parameter_list`.
At most one partial type declaration of a partial record may provide a `parameter_list`.
It is an error for a `parameter_list` to be empty.
Record parameters cannot use `ref`, `out` or `this` modifiers (but `in` and `params` are allowed).
@ -385,7 +384,7 @@ For a record:
### Deconstruct
A positional record synthesizes a public void-returning instance method called Deconstruct with an out
A positional record with at least one parameter synthesizes a public void-returning instance method called Deconstruct with an out
parameter declaration for each parameter of the primary constructor declaration. Each parameter
of the Deconstruct method has the same type as the corresponding parameter of the primary
constructor declaration. The body of the method assigns each parameter of the Deconstruct method