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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/function/call/alias.carbon
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+4 -4
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@@ -17,7 +17,7 @@ fn A() -> () { return (); }
alias B = A;
fn Main() {
var b: () = B();
var unused b: () = B();
}
// CHECK:STDOUT: --- alias.carbon
@@ -86,9 +86,9 @@ fn Main() {
// CHECK:STDOUT: %B.ref: %A.type = name_ref B, file.%B [concrete = constants.%A]
// CHECK:STDOUT: %A.call: init %empty_tuple.type = call %B.ref()
// CHECK:STDOUT: assign %b.var, %A.call
// CHECK:STDOUT: %.loc20_11.1: type = splice_block %.loc20_11.3 [concrete = constants.%empty_tuple.type] {
// CHECK:STDOUT: %.loc20_11.2: %empty_tuple.type = tuple_literal () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc20_11.3: type = converted %.loc20_11.2, constants.%empty_tuple.type [concrete = constants.%empty_tuple.type]
// CHECK:STDOUT: %.loc20_18.1: type = splice_block %.loc20_18.3 [concrete = constants.%empty_tuple.type] {
// CHECK:STDOUT: %.loc20_18.2: %empty_tuple.type = tuple_literal () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc20_18.3: type = converted %.loc20_18.2, constants.%empty_tuple.type [concrete = constants.%empty_tuple.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %b: ref %empty_tuple.type = ref_binding b, %b.var
// CHECK:STDOUT: %DestroyOp.bound: <bound method> = bound_method %b.var, constants.%DestroyOp