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Add tests of .Self given for an interface parameter that has constraints #6181

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Merged
merged 2 commits into from
Oct 8, 2025
Merged

Add tests of .Self given for an interface parameter that has constraints #6181

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167f710
test-compound-self
danakj Oct 8, 2025
ab3a564
add-one-more
danakj Oct 8, 2025
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36 changes: 36 additions & 0 deletions toolchain/check/testdata/facet/period_self.carbon
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Original file line number Diff line number Diff line change
Expand Up @@ -313,6 +313,42 @@ interface I(T:! Core.Destroy) {}
// The `.Self` can see the LHS of the `where` to know `U` impls Core.Destroy.
fn F(U:! Core.Destroy where .Self impls I(.Self)) {}

// --- fail_todo_period_self_parameter_constraint_satisfied_with_type_and.carbon
library "[[@TEST_NAME]]";

interface I(T:! Core.Destroy) {}

// TODO: Implied constraints that `.Self` impls `Core.Destroy` are satisfied by
// the `&` expression.
//
// CHECK:STDERR: fail_todo_period_self_parameter_constraint_satisfied_with_type_and.carbon:[[@LINE+7]]:25: error: cannot convert type `.Self` that implements `type` into type implementing `Core.Destroy` [ConversionFailureFacetToFacet]
// CHECK:STDERR: fn F(U:! Core.Destroy & I(.Self)) {}
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR: fail_todo_period_self_parameter_constraint_satisfied_with_type_and.carbon:[[@LINE-8]]:13: note: initializing generic parameter `T` declared here [InitializingGenericParam]
// CHECK:STDERR: interface I(T:! Core.Destroy) {}
// CHECK:STDERR: ^
// CHECK:STDERR:
fn F(U:! Core.Destroy & I(.Self)) {}

// --- fail_todo_compound_lookup_on_returned_period_self_parameter.carbon
library "[[@TEST_NAME]]";

interface I(T:! Core.Destroy) {
fn G[self: Self]() -> T;
}

fn F[U:! Core.Destroy where .Self impls I(.Self)](u: U) {
// This tests that both `I.G` is accessible and that `Destroy` is preserved;
// we'd get an error for missing Destroy otherwise since G() returns an
// initializing expression.

// CHECK:STDERR: fail_todo_compound_lookup_on_returned_period_self_parameter.carbon:[[@LINE+4]]:3: error: cannot access member of interface `I(U as Core.Destroy)` in type `U` that does not implement that interface [MissingImplInMemberAccess]
// CHECK:STDERR: u.(I(U).G)().(I(U).G)().(I(U).G)();
// CHECK:STDERR: ^~~~~~~~~~
// CHECK:STDERR:
u.(I(U).G)().(I(U).G)().(I(U).G)();
}

// CHECK:STDOUT: --- period_self_param.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
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