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carbon-lang/toolchain/check/testdata/generic/template_dependence.carbon
T
Chandler Carruth 8be274cf60 Replace :! binding syntax with phase keywords and contextual defaults (#7479) 
Implement the toolchain side of proposal #7254, removing the `:!`
binding
syntax for generic and template parameters in favor of the keywords
`generic`,
`template`, and `runtime` plus contextual defaults for phase.

For valid programs this is semantics-preserving: each binding resolves
to the
same phase, and produces the same SemIR, as it did under `:!`/`:`. The
parser
derives a binding's phase from its syntactic context plus any explicit
phase
keyword; new diagnostics and error recovery for misused keywords are
described
below.

Implementation details for each component:

- Lexer: remove the `:!` (`ColonExclaim`) token, move its virtual
parse-node
  budget onto `:`, and add the `generic` and `runtime` keywords.
- Parser: thread a `BindingContext` (`ExplicitParam`, `DeducedParam`, or
`CompileTimeEntityParam`) from declaration introducers down through
parameter
lists to each binding pattern, using a one-token lookahead to
distinguish a
name-qualifier parameter list from a declaration's own final list.
Parameters
of a compile-time entity (`class`, `interface`, `constraint`, `choice`,
`alias`, `export`, `namespace`) and deduced `[]` parameters default to
checked
generic; explicit function parameters and local bindings default to
runtime.
`HandleBindingPattern` resolves the phase from that context plus the
keyword: a
`generic` keyword needs no node of its own (the phase is carried by the
  binding's node kind), while a `runtime` keyword is preserved as a
`RuntimeBindingName` node so `check` can name it in a diagnostic. A
phase
keyword that is merely redundant with the contextual default is
diagnosed
  here, without invalidating the parse tree.
- Check: a phase keyword that is invalid for its context (for example
`runtime`
on a checked-generic parameter) is diagnosed here, and recovers by
building an
error binding that still introduces the name so that later uses of it do
not
  produce cascading errors.

The removed `:!` syntax is now rejected as an ordinary parse error.

The `form`/`:?`/`->?` ("extended types") portion of proposal #7254 is
left for a
separate change.

Assisted-by: Claude Code
2026-07-11 01:22:44 +00:00

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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/convert.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/generic/template_dependence.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/generic/template_dependence.carbon
// --- type.carbon
library "[[@TEST_NAME]]";
//@dump-sem-ir-begin
fn F[template T: type](x: T**) -> T* {
return *x;
}
//@dump-sem-ir-end
// --- mixed.carbon
library "[[@TEST_NAME]]";
//@dump-sem-ir-begin
fn F(template T: type, generic U: type) -> (T, U) {
return F(T, U);
}
//@dump-sem-ir-end
// CHECK:STDOUT: --- type.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %.Self.frozen: %type = symbolic_binding .Self [symbolic_self]
// CHECK:STDOUT: %pattern_type.98f: type = pattern_type type [concrete]
// CHECK:STDOUT: %T.patt.d47011.1: %pattern_type.98f = symbolic_binding_pattern T, 0, template [template]
// CHECK:STDOUT: %T.67db0b.1: type = symbolic_binding T, 0, template [template]
// CHECK:STDOUT: %ptr.e8f8f9.1: type = ptr_type %T.67db0b.1 [template]
// CHECK:STDOUT: %ptr.125: type = ptr_type %ptr.e8f8f9.1 [template]
// CHECK:STDOUT: %pattern_type.8bb: type = pattern_type %ptr.125 [template]
// CHECK:STDOUT: %x.param_patt: %pattern_type.8bb = value_param_pattern [template]
// CHECK:STDOUT: %x.patt: %pattern_type.8bb = at_binding_pattern x, %x.param_patt [template]
// CHECK:STDOUT: %.cb6cb9.1: Core.Form = init_form %ptr.e8f8f9.1 [template]
// CHECK:STDOUT: %pattern_type.4f4b84.1: type = pattern_type %ptr.e8f8f9.1 [template]
// CHECK:STDOUT: %return.param_patt.27f587.1: %pattern_type.4f4b84.1 = out_param_pattern [template]
// CHECK:STDOUT: %return.patt.d67: %pattern_type.4f4b84.1 = return_slot_pattern %return.param_patt.27f587.1, %ptr.e8f8f9.1 [template]
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: %require_complete.fbe: <witness> = require_complete_type %ptr.125 [template]
// CHECK:STDOUT: %require_complete.ef162c.1: <witness> = require_complete_type %ptr.e8f8f9.1 [template]
// CHECK:STDOUT: %Copy.type: type = facet_type <@Copy> [concrete]
// CHECK:STDOUT: %Copy.lookup_impl_witness.1da: <witness> = lookup_impl_witness %ptr.e8f8f9.1, @Copy [template]
// CHECK:STDOUT: %.0e9: require_specific_def_type = require_specific_def @ptr.as.Copy.impl(%T.67db0b.1) [template]
// CHECK:STDOUT: %Copy.facet: %Copy.type = facet_value %ptr.e8f8f9.1, (%Copy.lookup_impl_witness.1da) [template]
// CHECK:STDOUT: %Copy.WithSelf.Op.type.884: type = fn_type @Copy.WithSelf.Op, @Copy.WithSelf(%Copy.facet) [template]
// CHECK:STDOUT: %.be5: type = fn_type_with_self_type %Copy.WithSelf.Op.type.884, %Copy.facet [template]
// CHECK:STDOUT: %impl.elem0.484: %.be5 = impl_witness_access %Copy.lookup_impl_witness.1da, element0 [template]
// CHECK:STDOUT: %specific_impl_fn.a76: <specific function> = specific_impl_function %impl.elem0.484, @Copy.WithSelf.Op(%Copy.facet) [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {
// CHECK:STDOUT: %T.patt.loc5_16.1: %pattern_type.98f = symbolic_binding_pattern T, 0, template [template = %T.patt.loc5_16.2 (constants.%T.patt.d47011.1)]
// CHECK:STDOUT: %x.param_patt.loc5_25.1: @F.%pattern_type.loc5_25 (%pattern_type.8bb) = value_param_pattern [template = %x.param_patt.loc5_25.2 (constants.%x.param_patt)]
// CHECK:STDOUT: %x.patt.loc5_25.1: @F.%pattern_type.loc5_25 (%pattern_type.8bb) = at_binding_pattern x, %x.param_patt.loc5_25.1 [template = %x.patt.loc5_25.2 (constants.%x.patt)]
// CHECK:STDOUT: %return.param_patt.loc5_36.1: @F.%pattern_type.loc5_36 (%pattern_type.4f4b84.1) = out_param_pattern [template = %return.param_patt.loc5_36.2 (constants.%return.param_patt.27f587.1)]
// CHECK:STDOUT: %return.patt.loc5_32.1: @F.%pattern_type.loc5_36 (%pattern_type.4f4b84.1) = return_slot_pattern %return.param_patt.loc5_36.1, %ptr.loc5_36 [template = %return.patt.loc5_32.2 (constants.%return.patt.d67)]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %T.ref.loc5_35: type = name_ref T, %T.loc5_16.2 [template = %T.loc5_16.1 (constants.%T.67db0b.1)]
// CHECK:STDOUT: %ptr.loc5_36: type = ptr_type %T.ref.loc5_35 [template = %ptr.loc5_28.1 (constants.%ptr.e8f8f9.1)]
// CHECK:STDOUT: %.loc5_36.2: Core.Form = init_form %ptr.loc5_36 [template = %.loc5_36.1 (constants.%.cb6cb9.1)]
// CHECK:STDOUT: %.loc5_18.1: type = splice_block %.loc5_18.2 [concrete = type] {
// CHECK:STDOUT: %.Self.frozen: %type = symbolic_binding .Self [symbolic_self = constants.%.Self.frozen]
// CHECK:STDOUT: %.loc5_18.2: type = type_literal type [concrete = type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %T.loc5_16.2: type = symbolic_binding T, 0, template [template = %T.loc5_16.1 (constants.%T.67db0b.1)]
// CHECK:STDOUT: %x.param: @F.%ptr.loc5_29.1 (%ptr.125) = value_param call_param0
// CHECK:STDOUT: %.loc5_29: type = splice_block %ptr.loc5_29.2 [template = %ptr.loc5_29.1 (constants.%ptr.125)] {
// CHECK:STDOUT: %T.ref.loc5_27: type = name_ref T, %T.loc5_16.2 [template = %T.loc5_16.1 (constants.%T.67db0b.1)]
// CHECK:STDOUT: %ptr.loc5_28.2: type = ptr_type %T.ref.loc5_27 [template = %ptr.loc5_28.1 (constants.%ptr.e8f8f9.1)]
// CHECK:STDOUT: %ptr.loc5_29.2: type = ptr_type %ptr.loc5_28.2 [template = %ptr.loc5_29.1 (constants.%ptr.125)]
// CHECK:STDOUT: }
// CHECK:STDOUT: %x: @F.%ptr.loc5_29.1 (%ptr.125) = wrapper_binding x, %x.param
// CHECK:STDOUT: %return.param: ref @F.%ptr.loc5_28.1 (%ptr.e8f8f9.1) = out_param call_param1
// CHECK:STDOUT: %return: ref @F.%ptr.loc5_28.1 (%ptr.e8f8f9.1) = return_slot %return.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @F(%T.loc5_16.2: type) {
// CHECK:STDOUT: %T.patt.loc5_16.2: %pattern_type.98f = symbolic_binding_pattern T, 0, template [template = %T.patt.loc5_16.2 (constants.%T.patt.d47011.1)]
// CHECK:STDOUT: %T.loc5_16.1: type = symbolic_binding T, 0, template [template = %T.loc5_16.1 (constants.%T.67db0b.1)]
// CHECK:STDOUT: %ptr.loc5_28.1: type = ptr_type %T.loc5_16.1 [template = %ptr.loc5_28.1 (constants.%ptr.e8f8f9.1)]
// CHECK:STDOUT: %ptr.loc5_29.1: type = ptr_type %ptr.loc5_28.1 [template = %ptr.loc5_29.1 (constants.%ptr.125)]
// CHECK:STDOUT: %pattern_type.loc5_25: type = pattern_type %ptr.loc5_29.1 [template = %pattern_type.loc5_25 (constants.%pattern_type.8bb)]
// CHECK:STDOUT: %x.param_patt.loc5_25.2: @F.%pattern_type.loc5_25 (%pattern_type.8bb) = value_param_pattern [template = %x.param_patt.loc5_25.2 (constants.%x.param_patt)]
// CHECK:STDOUT: %x.patt.loc5_25.2: @F.%pattern_type.loc5_25 (%pattern_type.8bb) = at_binding_pattern x, %x.param_patt.loc5_25.2 [template = %x.patt.loc5_25.2 (constants.%x.patt)]
// CHECK:STDOUT: %.loc5_36.1: Core.Form = init_form %ptr.loc5_28.1 [template = %.loc5_36.1 (constants.%.cb6cb9.1)]
// CHECK:STDOUT: %pattern_type.loc5_36: type = pattern_type %ptr.loc5_28.1 [template = %pattern_type.loc5_36 (constants.%pattern_type.4f4b84.1)]
// CHECK:STDOUT: %return.param_patt.loc5_36.2: @F.%pattern_type.loc5_36 (%pattern_type.4f4b84.1) = out_param_pattern [template = %return.param_patt.loc5_36.2 (constants.%return.param_patt.27f587.1)]
// CHECK:STDOUT: %return.patt.loc5_32.2: @F.%pattern_type.loc5_36 (%pattern_type.4f4b84.1) = return_slot_pattern %return.param_patt.loc5_36.2, %ptr.loc5_28.1 [template = %return.patt.loc5_32.2 (constants.%return.patt.d67)]
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %require_complete.loc5_25: <witness> = require_complete_type %ptr.loc5_29.1 [template = %require_complete.loc5_25 (constants.%require_complete.fbe)]
// CHECK:STDOUT: %require_complete.loc5_32: <witness> = require_complete_type %ptr.loc5_28.1 [template = %require_complete.loc5_32 (constants.%require_complete.ef162c.1)]
// CHECK:STDOUT: %.loc6_10.5: require_specific_def_type = require_specific_def @ptr.as.Copy.impl(%T.loc5_16.1) [template = %.loc6_10.5 (constants.%.0e9)]
// CHECK:STDOUT: %Copy.lookup_impl_witness: <witness> = lookup_impl_witness %ptr.loc5_28.1, @Copy [template = %Copy.lookup_impl_witness (constants.%Copy.lookup_impl_witness.1da)]
// CHECK:STDOUT: %Copy.facet.loc6_10.3: %Copy.type = facet_value %ptr.loc5_28.1, (%Copy.lookup_impl_witness) [template = %Copy.facet.loc6_10.3 (constants.%Copy.facet)]
// CHECK:STDOUT: %Copy.WithSelf.Op.type: type = fn_type @Copy.WithSelf.Op, @Copy.WithSelf(%Copy.facet.loc6_10.3) [template = %Copy.WithSelf.Op.type (constants.%Copy.WithSelf.Op.type.884)]
// CHECK:STDOUT: %.loc6_10.6: type = fn_type_with_self_type %Copy.WithSelf.Op.type, %Copy.facet.loc6_10.3 [template = %.loc6_10.6 (constants.%.be5)]
// CHECK:STDOUT: %impl.elem0.loc6_10.2: @F.%.loc6_10.6 (%.be5) = impl_witness_access %Copy.lookup_impl_witness, element0 [template = %impl.elem0.loc6_10.2 (constants.%impl.elem0.484)]
// CHECK:STDOUT: %specific_impl_fn.loc6_10.2: <specific function> = specific_impl_function %impl.elem0.loc6_10.2, @Copy.WithSelf.Op(%Copy.facet.loc6_10.3) [template = %specific_impl_fn.loc6_10.2 (constants.%specific_impl_fn.a76)]
// CHECK:STDOUT:
// CHECK:STDOUT: fn(%x.param: @F.%ptr.loc5_29.1 (%ptr.125)) -> out %return.param: @F.%ptr.loc5_28.1 (%ptr.e8f8f9.1) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %x.ref: @F.%ptr.loc5_29.1 (%ptr.125) = name_ref x, %x
// CHECK:STDOUT: %.loc6_10.1: ref @F.%ptr.loc5_28.1 (%ptr.e8f8f9.1) = deref %x.ref
// CHECK:STDOUT: %.loc6_10.2: @F.%ptr.loc5_28.1 (%ptr.e8f8f9.1) = acquire_value %.loc6_10.1
// CHECK:STDOUT: %impl.elem0.loc6_10.1: @F.%.loc6_10.6 (%.be5) = impl_witness_access constants.%Copy.lookup_impl_witness.1da, element0 [template = %impl.elem0.loc6_10.2 (constants.%impl.elem0.484)]
// CHECK:STDOUT: %bound_method.loc6_10.1: <bound method> = bound_method %.loc6_10.2, %impl.elem0.loc6_10.1
// CHECK:STDOUT: %Copy.facet.loc6_10.1: %Copy.type = facet_value constants.%ptr.e8f8f9.1, (constants.%Copy.lookup_impl_witness.1da) [template = %Copy.facet.loc6_10.3 (constants.%Copy.facet)]
// CHECK:STDOUT: %.loc6_10.3: %Copy.type = converted constants.%ptr.e8f8f9.1, %Copy.facet.loc6_10.1 [template = %Copy.facet.loc6_10.3 (constants.%Copy.facet)]
// CHECK:STDOUT: %Copy.facet.loc6_10.2: %Copy.type = facet_value constants.%ptr.e8f8f9.1, (constants.%Copy.lookup_impl_witness.1da) [template = %Copy.facet.loc6_10.3 (constants.%Copy.facet)]
// CHECK:STDOUT: %.loc6_10.4: %Copy.type = converted constants.%ptr.e8f8f9.1, %Copy.facet.loc6_10.2 [template = %Copy.facet.loc6_10.3 (constants.%Copy.facet)]
// CHECK:STDOUT: %specific_impl_fn.loc6_10.1: <specific function> = specific_impl_function %impl.elem0.loc6_10.1, @Copy.WithSelf.Op(constants.%Copy.facet) [template = %specific_impl_fn.loc6_10.2 (constants.%specific_impl_fn.a76)]
// CHECK:STDOUT: %bound_method.loc6_10.2: <bound method> = bound_method %.loc6_10.2, %specific_impl_fn.loc6_10.1
// CHECK:STDOUT: %Copy.WithSelf.Op.call: init @F.%ptr.loc5_28.1 (%ptr.e8f8f9.1) = call %bound_method.loc6_10.2(%.loc6_10.2)
// CHECK:STDOUT: return %Copy.WithSelf.Op.call
// CHECK:STDOUT:
// CHECK:STDOUT: !observes:
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @F(constants.%T.67db0b.1) {
// CHECK:STDOUT: %T.patt.loc5_16.2 => constants.%T.patt.d47011.1
// CHECK:STDOUT: %T.loc5_16.1 => constants.%T.67db0b.1
// CHECK:STDOUT: %ptr.loc5_28.1 => constants.%ptr.e8f8f9.1
// CHECK:STDOUT: %ptr.loc5_29.1 => constants.%ptr.125
// CHECK:STDOUT: %pattern_type.loc5_25 => constants.%pattern_type.8bb
// CHECK:STDOUT: %x.param_patt.loc5_25.2 => constants.%x.param_patt
// CHECK:STDOUT: %x.patt.loc5_25.2 => constants.%x.patt
// CHECK:STDOUT: %.loc5_36.1 => constants.%.cb6cb9.1
// CHECK:STDOUT: %pattern_type.loc5_36 => constants.%pattern_type.4f4b84.1
// CHECK:STDOUT: %return.param_patt.loc5_36.2 => constants.%return.param_patt.27f587.1
// CHECK:STDOUT: %return.patt.loc5_32.2 => constants.%return.patt.d67
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- mixed.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %.Self.frozen: %type = symbolic_binding .Self [symbolic_self]
// CHECK:STDOUT: %pattern_type.98f: type = pattern_type type [concrete]
// CHECK:STDOUT: %T.patt: %pattern_type.98f = symbolic_binding_pattern T, 0, template [template]
// CHECK:STDOUT: %T: type = symbolic_binding T, 0, template [template]
// CHECK:STDOUT: %U.patt: %pattern_type.98f = symbolic_binding_pattern U, 1 [symbolic]
// CHECK:STDOUT: %U: type = symbolic_binding U, 1 [symbolic]
// CHECK:STDOUT: %tuple.type.24b: type = tuple_type (type, type) [concrete]
// CHECK:STDOUT: %tuple: %tuple.type.24b = tuple_value (%T, %U) [template]
// CHECK:STDOUT: %tuple.type.a5e: type = tuple_type (%T, %U) [template]
// CHECK:STDOUT: %.f18: Core.Form = init_form %tuple.type.a5e [template]
// CHECK:STDOUT: %pattern_type.eee: type = pattern_type %tuple.type.a5e [template]
// CHECK:STDOUT: %return.param_patt: %pattern_type.eee = out_param_pattern [template]
// CHECK:STDOUT: %return.patt: %pattern_type.eee = return_slot_pattern %return.param_patt, %tuple.type.a5e [template]
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: %require_complete: <witness> = require_complete_type %tuple.type.a5e [template]
// CHECK:STDOUT: %F.specific_fn: <specific function> = specific_function %F, @F(%T, %U) [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {
// CHECK:STDOUT: %T.patt.loc5_16.1: %pattern_type.98f = symbolic_binding_pattern T, 0, template [template = %T.patt.loc5_16.2 (constants.%T.patt)]
// CHECK:STDOUT: %U.patt.loc5_33.1: %pattern_type.98f = symbolic_binding_pattern U, 1 [symbolic = %U.patt.loc5_33.2 (constants.%U.patt)]
// CHECK:STDOUT: %return.param_patt.loc5_49.1: @F.%pattern_type (%pattern_type.eee) = out_param_pattern [template = %return.param_patt.loc5_49.2 (constants.%return.param_patt)]
// CHECK:STDOUT: %return.patt.loc5_41.1: @F.%pattern_type (%pattern_type.eee) = return_slot_pattern %return.param_patt.loc5_49.1, %.loc5_49.4 [template = %return.patt.loc5_41.2 (constants.%return.patt)]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %T.ref.loc5: type = name_ref T, %T.loc5_16.2 [template = %T.loc5_16.1 (constants.%T)]
// CHECK:STDOUT: %U.ref.loc5: type = name_ref U, %U.loc5_33.2 [symbolic = %U.loc5_33.1 (constants.%U)]
// CHECK:STDOUT: %.loc5_49.3: %tuple.type.24b = tuple_literal (%T.ref.loc5, %U.ref.loc5) [template = %tuple (constants.%tuple)]
// CHECK:STDOUT: %.loc5_49.4: type = converted %.loc5_49.3, constants.%tuple.type.a5e [template = %tuple.type (constants.%tuple.type.a5e)]
// CHECK:STDOUT: %.loc5_49.5: Core.Form = init_form %.loc5_49.4 [template = %.loc5_49.2 (constants.%.f18)]
// CHECK:STDOUT: %.loc5_18.1: type = splice_block %.loc5_18.2 [concrete = type] {
// CHECK:STDOUT: %.Self.frozen.loc5_16: %type = symbolic_binding .Self [symbolic_self = constants.%.Self.frozen]
// CHECK:STDOUT: %.loc5_18.2: type = type_literal type [concrete = type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %T.loc5_16.2: type = symbolic_binding T, 0, template [template = %T.loc5_16.1 (constants.%T)]
// CHECK:STDOUT: %.loc5_35.1: type = splice_block %.loc5_35.2 [concrete = type] {
// CHECK:STDOUT: %.Self.frozen.loc5_33: %type = symbolic_binding .Self [symbolic_self = constants.%.Self.frozen]
// CHECK:STDOUT: %.loc5_35.2: type = type_literal type [concrete = type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %U.loc5_33.2: type = symbolic_binding U, 1 [symbolic = %U.loc5_33.1 (constants.%U)]
// CHECK:STDOUT: %return.param: ref @F.%tuple.type (%tuple.type.a5e) = out_param call_param0
// CHECK:STDOUT: %return: ref @F.%tuple.type (%tuple.type.a5e) = return_slot %return.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @F(%T.loc5_16.2: type, %U.loc5_33.2: type) {
// CHECK:STDOUT: %T.patt.loc5_16.2: %pattern_type.98f = symbolic_binding_pattern T, 0, template [template = %T.patt.loc5_16.2 (constants.%T.patt)]
// CHECK:STDOUT: %T.loc5_16.1: type = symbolic_binding T, 0, template [template = %T.loc5_16.1 (constants.%T)]
// CHECK:STDOUT: %U.patt.loc5_33.2: %pattern_type.98f = symbolic_binding_pattern U, 1 [symbolic = %U.patt.loc5_33.2 (constants.%U.patt)]
// CHECK:STDOUT: %U.loc5_33.1: type = symbolic_binding U, 1 [symbolic = %U.loc5_33.1 (constants.%U)]
// CHECK:STDOUT: %tuple: %tuple.type.24b = tuple_value (%T.loc5_16.1, %U.loc5_33.1) [template = %tuple (constants.%tuple)]
// CHECK:STDOUT: %tuple.type: type = tuple_type (%T.loc5_16.1, %U.loc5_33.1) [template = %tuple.type (constants.%tuple.type.a5e)]
// CHECK:STDOUT: %.loc5_49.2: Core.Form = init_form %tuple.type [template = %.loc5_49.2 (constants.%.f18)]
// CHECK:STDOUT: %pattern_type: type = pattern_type %tuple.type [template = %pattern_type (constants.%pattern_type.eee)]
// CHECK:STDOUT: %return.param_patt.loc5_49.2: @F.%pattern_type (%pattern_type.eee) = out_param_pattern [template = %return.param_patt.loc5_49.2 (constants.%return.param_patt)]
// CHECK:STDOUT: %return.patt.loc5_41.2: @F.%pattern_type (%pattern_type.eee) = return_slot_pattern %return.param_patt.loc5_49.2, %tuple.type [template = %return.patt.loc5_41.2 (constants.%return.patt)]
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %require_complete: <witness> = require_complete_type %tuple.type [template = %require_complete (constants.%require_complete)]
// CHECK:STDOUT: %F.specific_fn.loc6_10.2: <specific function> = specific_function constants.%F, @F(%T.loc5_16.1, %U.loc5_33.1) [template = %F.specific_fn.loc6_10.2 (constants.%F.specific_fn)]
// CHECK:STDOUT:
// CHECK:STDOUT: fn() -> out %return.param: @F.%tuple.type (%tuple.type.a5e) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %F.ref: %F.type = name_ref F, file.%F.decl [concrete = constants.%F]
// CHECK:STDOUT: %T.ref.loc6: type = name_ref T, %T.loc5_16.2 [template = %T.loc5_16.1 (constants.%T)]
// CHECK:STDOUT: %U.ref.loc6: type = name_ref U, %U.loc5_33.2 [symbolic = %U.loc5_33.1 (constants.%U)]
// CHECK:STDOUT: %F.specific_fn.loc6_10.1: <specific function> = specific_function %F.ref, @F(constants.%T, constants.%U) [template = %F.specific_fn.loc6_10.2 (constants.%F.specific_fn)]
// CHECK:STDOUT: %.loc5_49.1: ref @F.%tuple.type (%tuple.type.a5e) = splice_block %return.param {}
// CHECK:STDOUT: %F.call: init @F.%tuple.type (%tuple.type.a5e) to %.loc5_49.1 = call %F.specific_fn.loc6_10.1()
// CHECK:STDOUT: return %F.call to %return.param
// CHECK:STDOUT:
// CHECK:STDOUT: !observes:
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @F(constants.%T, constants.%U) {
// CHECK:STDOUT: %T.patt.loc5_16.2 => constants.%T.patt
// CHECK:STDOUT: %T.loc5_16.1 => constants.%T
// CHECK:STDOUT: %U.patt.loc5_33.2 => constants.%U.patt
// CHECK:STDOUT: %U.loc5_33.1 => constants.%U
// CHECK:STDOUT: %tuple => constants.%tuple
// CHECK:STDOUT: %tuple.type => constants.%tuple.type.a5e
// CHECK:STDOUT: %.loc5_49.2 => constants.%.f18
// CHECK:STDOUT: %pattern_type => constants.%pattern_type.eee
// CHECK:STDOUT: %return.param_patt.loc5_49.2 => constants.%return.param_patt
// CHECK:STDOUT: %return.patt.loc5_41.2 => constants.%return.patt
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %require_complete => constants.%require_complete
// CHECK:STDOUT: %F.specific_fn.loc6_10.2 => constants.%F.specific_fn
// CHECK:STDOUT: }
// CHECK:STDOUT:
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