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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/interface/default_fn.carbon
Vendored
+4 -4
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@@ -15,7 +15,7 @@
class C {
interface I {
// TODO: Use `default` here.
fn F[self: Self]() {
fn F[unused self: Self]() {
// I and F are both complete here, and the impl below is in scope.
var c: C = {};
c.(I.F)();
@@ -23,7 +23,7 @@ class C {
}
impl C as I {
fn F[self: Self]() {}
fn F[unused self: Self]() {}
}
}
@@ -86,10 +86,10 @@ class C {
// CHECK:STDOUT: %self.param_patt: @I.WithSelf.F.%pattern_type (%pattern_type.b59) = value_param_pattern %self.patt, call_param0 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %self.param: @I.WithSelf.F.%Self.binding.as_type (%Self.binding.as_type.5c6) = value_param call_param0
// CHECK:STDOUT: %.loc18_16.1: type = splice_block %.loc18_16.2 [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type.5c6)] {
// CHECK:STDOUT: %.loc18_23.1: type = splice_block %.loc18_23.2 [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type.5c6)] {
// CHECK:STDOUT: %Self.ref: %I.type = name_ref Self, @I.%Self.loc16 [symbolic = %Self (constants.%Self.849)]
// CHECK:STDOUT: %Self.as_type: type = facet_access_type %Self.ref [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type.5c6)]
// CHECK:STDOUT: %.loc18_16.2: type = converted %Self.ref, %Self.as_type [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type.5c6)]
// CHECK:STDOUT: %.loc18_23.2: type = converted %Self.ref, %Self.as_type [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type.5c6)]
// CHECK:STDOUT: }
// CHECK:STDOUT: %self: @I.WithSelf.F.%Self.binding.as_type (%Self.binding.as_type.5c6) = value_binding self, %self.param
// CHECK:STDOUT: }