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TypeAlias syntax missing a TypeParamBounds #1032

Description

@GilRtr

this is valid syntactically:

type TypeAlias: TraitBound = SomeType;

however it is not part of the reference.

expectation:

Syntax
TypeAlias :
   type IDENTIFIER GenericParams? ( : TypeParamBounds )? WhereClause? ( = Type )? ;

*should be stated that this syntax is only useful in the context of an associated type and will yield bounds on `type`s in this context have no effect anywhere else.

edit: I accidently pressed enter before writing the description

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