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add nominal types for 2D points

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This commit is contained in:
Joeri Exelmans 2025-03-20 12:07:31 +01:00
parent 94efde3e65
commit 18b5e56ff0
6 changed files with 110 additions and 21 deletions
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4
generics/generics.js
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@ -15,6 +15,7 @@ export const makeGeneric = callback => {
};
};
// From the given set of type variables, return only those that occur in the given type.
const occurring = (type, typeVars) => {
if (typeVars.has(type)) {
return new Set([type]);
@ -36,7 +37,8 @@ const occurring = (type, typeVars) => {
// merge {i: [1], t: List_of_Int} ->
// Thanks to Hans for pointing out that this algorithm exactly like "Unification" in Prolog:
// https://www.dai.ed.ac.uk/groups/ssp/bookpages/quickprolog/node12.html
export const matchGeneric = (
{typeVars: formalTypeVars, type: formalType},
{typeVars: actualTypeVars, type: actualType},