added questions for optional type and type guard

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pca006132 2021-01-19 15:39:37 +08:00
parent 8d09aea1f7
commit 09234a416b
1 changed files with 5 additions and 0 deletions

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@ -126,6 +126,11 @@ class Foo(EnvExperiment):
* Type variable cannot occur alone in the result type, i.e. must be bound to the
input parameters.
Questions:
* Should we support things like optional type? (like the one in rust)
* Would it be better to assert on the type variable directly instead of
`type(x)` for type guards?
## Dynamic Dispatch
Type annotations are invariant, so subtype (derived types) cannot be used
when the base type is expected. Example: