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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/where_expr/dot_self_impls.carbon
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+6 -6
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@@ -57,7 +57,7 @@ interface J {
fn INotJ(T:! I where .Self impls J) {
// Gets `T.(I.F)`. Doesn't consider `T.(J.F)`, so no ambiguity.
let x: () = T.F();
let unused x: () = T.F();
}
// --- fail_name_lookup_through_where_self_impls.carbon
@@ -145,7 +145,7 @@ fn INotJ[T:! I where .Self impls J](x: T) {
library "[[@TEST_NAME]]";
class WrapType(T:! type) {}
fn AssertSame[T:! type](a: WrapType(T), b: WrapType(T)) {}
fn AssertSame[T:! type](unused a: WrapType(T), unused b: WrapType(T)) {}
fn Type(T:! type) -> WrapType(T) { return {}; }
interface I;
@@ -178,7 +178,7 @@ interface K {}
library "[[@TEST_NAME]]";
class WrapType(T:! type) {}
fn AssertSame[T:! type](a: WrapType(T), b: WrapType(T)) {}
fn AssertSame[T:! type](unused a: WrapType(T), unused b: WrapType(T)) {}
fn Type(T:! type) -> WrapType(T) { return {}; }
interface I { let A:! type; }
@@ -201,7 +201,7 @@ fn Test() {
library "[[@TEST_NAME]]";
class WrapType(T:! type) {}
fn Same[T:! type](a: WrapType(T), b: WrapType(T)) {}
fn Same[T:! type](unused a: WrapType(T), unused b: WrapType(T)) {}
fn Type(T:! type) -> WrapType(T) { return {}; }
interface I {}
@@ -212,8 +212,8 @@ fn Test() {
// CHECK:STDERR: Same(Type(I where .Self impls J), Type(J where .Self impls I));
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_compare_not_equal.carbon:[[@LINE-10]]:1: note: while deducing parameters of generic declared here [DeductionGenericHere]
// CHECK:STDERR: fn Same[T:! type](a: WrapType(T), b: WrapType(T)) {}
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR: fn Same[T:! type](unused a: WrapType(T), unused b: WrapType(T)) {}
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
Same(Type(I where .Self impls J), Type(J where .Self impls I));
}