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Mofei Zhang
76e6eff110
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Expand Hindley Milner type inference to infer dependent types.
Say `t` is a typevar and `t'` is some type (a built-in type, phi node, or
another typevar).
Our type equations are as follows (please edit/correct notation 😅)
- type substitution: `t = t'`,
- ~~dependent~~ polymorphic property load: `t = t'.prop`
- polymorphic function call `t = fnCall{returnType}`
- ~~dependent property call: `t = t'.prop` (only if t'.prop is a function
type)~~
- ~~dependent return type: `t = t'.[[returntype]]`~~