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The type Map<T, Foo<Set<T>>> contains one type variable referenced twice,
so there are two inputs into the HTypeInfoExpression instruction.
If Foo is a typedef, T can be reused, e.g.
typedef E Foo<E>(E a, E b);
As the typedef is expanded (to Function(Set<T>, Set<T>) => Set<T>) it
should not consume additional types from the to-level input. We
prevent this by capturing the types and using the captured type
expressions inside the typedef expansion.
TODO: We should make the type subexpression Foo<...> be a second
HTypeInfoExpression, with Set<T> as its input (a third
HTypeInfoExpression). This would share all the Set<T> subexpressions
instead of duplicating them. This would require HTypeInfoExpression
inputs to correspond to type variables AND typedefs.
BUG= https://github.com/dart-lang/sdk/issues/28749
R=efortuna@google.com
Review-Url: https://codereview.chromium.org/2812393003 .
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js_ast
A library for creating JavaScript ASTs from templates.