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union #shared_nil

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This adds a feature to `union` which requires all the variants to have a `nil` value and on assign to the union, checks whether that value is `nil` or not. If the value is `nil`, the union will be `nil` (thus sharing the `nil` value)
This commit is contained in:
gingerBill
2022-03-24 11:55:03 +00:00
parent 3e66eec735
commit 3f935bea25
10 changed files with 104 additions and 32 deletions
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src/check_type.cpp
+14 -5
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@@ -675,22 +675,31 @@ void check_union_type(CheckerContext *ctx, Type *union_type, Ast *node, Array<Op
}
if (ok) {
array_add(&variants, t);
if (ut->kind == UnionType_shared_nil) {
if (!type_has_nil(t)) {
gbString s = type_to_string(t);
error(node, "Each variant of a union with #shared_nil must have a 'nil' value, got %s", s);
gb_string_free(s);
}
}
}
}
}
union_type->Union.variants = slice_from_array(variants);
union_type->Union.no_nil = ut->no_nil;
union_type->Union.maybe = ut->maybe;
if (union_type->Union.no_nil) {
union_type->Union.kind = ut->kind;
switch (ut->kind) {
case UnionType_no_nil:
if (variants.count < 2) {
error(ut->align, "A union with #no_nil must have at least 2 variants");
}
}
if (union_type->Union.maybe) {
break;
case UnionType_maybe:
if (variants.count != 1) {
error(ut->align, "A union with #maybe must have at 1 variant, got %lld", cast(long long)variants.count);
}
break;
}
if (ut->align != nullptr) {