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Implement unused pattern bindings, continued (#6518)

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Implementation of unused pattern bindings #2022, continued.

Whereas previous PR #6460 took care of parsing, and PR #6479 prepared
the stage by using _ in some test cases, this PR has the the actual
implementation, using a simple dataflow analysis.

---------

Co-authored-by: Burak Emir <bqe@google.com>
Co-authored-by: jonmeow <jperkins@google.com>
This commit is contained in:
Burak Emir
2026-02-19 23:33:36 +00:00
committed by GitHub
co-authored by Burak Emir jonmeow
parent bea24a8bee
commit fdb188ccfd
366 changed files with 8453 additions and 7996 deletions
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toolchain/check/testdata/impl/using_invalid_interface.carbon
Vendored
+8 -8
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@@ -40,11 +40,11 @@ class C {
// CHECK:STDERR: ^
// CHECK:STDERR:
impl as IMisuse where .Arg = T {
// CHECK:STDERR: fail_misusing_invalid_interface.carbon:[[@LINE+4]]:35: error: name `T` not found [NameNotFound]
// CHECK:STDERR: fn Op[self: Self]() -> ArgToI(T) {
// CHECK:STDERR: ^
// CHECK:STDERR: fail_misusing_invalid_interface.carbon:[[@LINE+4]]:42: error: name `T` not found [NameNotFound]
// CHECK:STDERR: fn Op[unused self: Self]() -> ArgToI(T) {
// CHECK:STDERR: ^
// CHECK:STDERR:
fn Op[self: Self]() -> ArgToI(T) {
fn Op[unused self: Self]() -> ArgToI(T) {
return {};
}
}
@@ -84,15 +84,15 @@ class ArgC {}
class C {
impl as IMisuse where .Arg = ArgC {
// CHECK:STDERR: fail_using_invalid_interface.carbon:[[@LINE+8]]:28: error: cannot convert type `ArgC` into type implementing `I` [ConversionFailureTypeToFacet]
// CHECK:STDERR: fn Op[self: Self]() -> ArgToI(ArgC) {
// CHECK:STDERR: ^~~~~~~~~~~~
// CHECK:STDERR: fail_using_invalid_interface.carbon:[[@LINE+8]]:35: error: cannot convert type `ArgC` into type implementing `I` [ConversionFailureTypeToFacet]
// CHECK:STDERR: fn Op[unused self: Self]() -> ArgToI(ArgC) {
// CHECK:STDERR: ^~~~~~~~~~~~
// CHECK:STDERR: fail_using_invalid_interface.carbon:[[@LINE-9]]:1: in import [InImport]
// CHECK:STDERR: fail_invalid_interface.carbon:5:14: note: initializing generic parameter `T` declared here [InitializingGenericParam]
// CHECK:STDERR: class ArgToI(T:! I) {}
// CHECK:STDERR: ^
// CHECK:STDERR:
fn Op[self: Self]() -> ArgToI(ArgC) {
fn Op[unused self: Self]() -> ArgToI(ArgC) {
return {};
}
}