4efa3ddb87
This simplifies the use of parameterized interfaces as type bounds.
For example, given:
type Bound(type T) interface { ... }
we can use this interface as a type bound with or without instantiation
in a type parameter list:
func _(type T Bound(T)) ... // with explicit instantiation
func _(type T Bound) ... // instantiation left away
In the latter example, Bound is syntactic sugar for Bound(T).
In general, in a type parameter list, instantiation of an interface
type bound is optional iff the the type bound applies to exactly one
type parameter and the type bound expects exactly one type argument.
Change-Id: I0e820a0e214427cce6397069c1d5268494096812
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go2-dev/+/728411
Reviewed-by: Robert Griesemer <gri@google.com>
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