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carbon-lang/toolchain/check/testdata/class/import.carbon
T
Dana JansensandRichard Smith 0e8d354567 Split the witness table into a separate ImplWitnessTable instruction (#5272) 
This allows us to import the table for a given impl only once, while we
can import many ImplWitness instructions with different specifics for a
generic impl.

For example in convert_facet_value_to_narrowed_facet_type.carbon we see
that a single witness table is imported for the BitAnd interface, with
multiple witnesses (for different specifics) imported and sharing the
same table.

The ImplWitnessTable now contains a back-link to the Impl the witness is
for, allowing inst namer to name that interface in the textual semir,
and allowing the interface to be found when debugging from a witness.

---------

Co-authored-by: Richard Smith <richard@metafoo.co.uk>
2025-04-11 20:30:04 +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
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/class/import.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/class/import.carbon
// --- a.carbon
library "[[@TEST_NAME]]";
class Empty {
}
class Field {
var x: i32;
}
class ForwardDeclared;
class ForwardDeclared {
fn F[self: Self]();
fn G[addr self: Self*]();
}
class Incomplete;
// --- b.carbon
library "[[@TEST_NAME]]";
import library "a";
fn Run() {
var a: Empty = {};
var b: Field = {.x = 1};
b.x = 2;
var c: ForwardDeclared = {};
c.F();
c.G();
var d: ForwardDeclared* = &c;
var e: Incomplete*;
}
// CHECK:STDOUT: --- a.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Empty: type = class_type @Empty [concrete]
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT: %complete_type.357: <witness> = complete_type_witness %empty_struct_type [concrete]
// CHECK:STDOUT: %Field: type = class_type @Field [concrete]
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [concrete]
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(%int_32) [concrete]
// CHECK:STDOUT: %Field.elem: type = unbound_element_type %Field, %i32 [concrete]
// CHECK:STDOUT: %struct_type.x: type = struct_type {.x: %i32} [concrete]
// CHECK:STDOUT: %complete_type.1ec: <witness> = complete_type_witness %struct_type.x [concrete]
// CHECK:STDOUT: %ForwardDeclared: type = class_type @ForwardDeclared [concrete]
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: %ptr: type = ptr_type %ForwardDeclared [concrete]
// CHECK:STDOUT: %G.type: type = fn_type @G [concrete]
// CHECK:STDOUT: %G: %G.type = struct_value () [concrete]
// CHECK:STDOUT: %Incomplete: type = class_type @Incomplete [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: .Int = %Core.Int
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: .Empty = %Empty.decl
// CHECK:STDOUT: .Field = %Field.decl
// CHECK:STDOUT: .ForwardDeclared = %ForwardDeclared.decl.loc11
// CHECK:STDOUT: .Incomplete = %Incomplete.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %Empty.decl: type = class_decl @Empty [concrete = constants.%Empty] {} {}
// CHECK:STDOUT: %Field.decl: type = class_decl @Field [concrete = constants.%Field] {} {}
// CHECK:STDOUT: %ForwardDeclared.decl.loc11: type = class_decl @ForwardDeclared [concrete = constants.%ForwardDeclared] {} {}
// CHECK:STDOUT: %ForwardDeclared.decl.loc13: type = class_decl @ForwardDeclared [concrete = constants.%ForwardDeclared] {} {}
// CHECK:STDOUT: %Incomplete.decl: type = class_decl @Incomplete [concrete = constants.%Incomplete] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Empty {
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete = constants.%empty_struct_type]
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete = constants.%complete_type.357]
// CHECK:STDOUT: complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = constants.%Empty
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Field {
// CHECK:STDOUT: %.loc8_8: %Field.elem = field_decl x, element0 [concrete]
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %.loc8_3: %Field.elem = var_pattern %.loc8_8
// CHECK:STDOUT: }
// CHECK:STDOUT: %.var: ref %Field.elem = var <none>
// CHECK:STDOUT: %struct_type.x: type = struct_type {.x: %i32} [concrete = constants.%struct_type.x]
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness %struct_type.x [concrete = constants.%complete_type.1ec]
// CHECK:STDOUT: complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = constants.%Field
// CHECK:STDOUT: .x = %.loc8_8
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @ForwardDeclared {
// CHECK:STDOUT: %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {
// CHECK:STDOUT: %self.patt: %ForwardDeclared = binding_pattern self
// CHECK:STDOUT: %self.param_patt: %ForwardDeclared = value_param_pattern %self.patt, call_param0
// CHECK:STDOUT: } {
// CHECK:STDOUT: %self.param: %ForwardDeclared = value_param call_param0
// CHECK:STDOUT: %Self.ref: type = name_ref Self, constants.%ForwardDeclared [concrete = constants.%ForwardDeclared]
// CHECK:STDOUT: %self: %ForwardDeclared = bind_name self, %self.param
// CHECK:STDOUT: }
// CHECK:STDOUT: %G.decl: %G.type = fn_decl @G [concrete = constants.%G] {
// CHECK:STDOUT: %self.patt: %ptr = binding_pattern self
// CHECK:STDOUT: %self.param_patt: %ptr = value_param_pattern %self.patt, call_param0
// CHECK:STDOUT: %.loc15_8: auto = addr_pattern %self.param_patt
// CHECK:STDOUT: } {
// CHECK:STDOUT: %self.param: %ptr = value_param call_param0
// CHECK:STDOUT: %.loc15_23: type = splice_block %ptr [concrete = constants.%ptr] {
// CHECK:STDOUT: %Self.ref: type = name_ref Self, constants.%ForwardDeclared [concrete = constants.%ForwardDeclared]
// CHECK:STDOUT: %ptr: type = ptr_type %Self.ref [concrete = constants.%ptr]
// CHECK:STDOUT: }
// CHECK:STDOUT: %self: %ptr = bind_name self, %self.param
// CHECK:STDOUT: }
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete = constants.%empty_struct_type]
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete = constants.%complete_type.357]
// CHECK:STDOUT: complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = constants.%ForwardDeclared
// CHECK:STDOUT: .F = %F.decl
// CHECK:STDOUT: .G = %G.decl
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Incomplete;
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F[%self.param_patt: %ForwardDeclared]();
// CHECK:STDOUT:
// CHECK:STDOUT: fn @G[addr %self.param_patt: %ptr]();
// CHECK:STDOUT:
// CHECK:STDOUT: --- b.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Run.type: type = fn_type @Run [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %Run: %Run.type = struct_value () [concrete]
// CHECK:STDOUT: %Empty: type = class_type @Empty [concrete]
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT: %complete_type.357: <witness> = complete_type_witness %empty_struct_type [concrete]
// CHECK:STDOUT: %Empty.val: %Empty = struct_value () [concrete]
// CHECK:STDOUT: %Field: type = class_type @Field [concrete]
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [concrete]
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(%int_32) [concrete]
// CHECK:STDOUT: %struct_type.x.767: type = struct_type {.x: %i32} [concrete]
// CHECK:STDOUT: %complete_type.c07: <witness> = complete_type_witness %struct_type.x.767 [concrete]
// CHECK:STDOUT: %int_1.5b8: Core.IntLiteral = int_value 1 [concrete]
// CHECK:STDOUT: %struct_type.x.c96: type = struct_type {.x: Core.IntLiteral} [concrete]
// CHECK:STDOUT: %ImplicitAs.type.9ba: type = facet_type <@ImplicitAs, @ImplicitAs(%i32)> [concrete]
// CHECK:STDOUT: %Convert.type.6da: type = fn_type @Convert.1, @ImplicitAs(%i32) [concrete]
// CHECK:STDOUT: %ImplicitAs.impl_witness_table.e36 = impl_witness_table (imports.%Core.import_ref.a86), @impl.c81 [concrete]
// CHECK:STDOUT: %ImplicitAs.impl_witness.e34: <witness> = impl_witness %ImplicitAs.impl_witness_table.e36, @impl.c81(%int_32) [concrete]
// CHECK:STDOUT: %Convert.type.ed5: type = fn_type @Convert.2, @impl.c81(%int_32) [concrete]
// CHECK:STDOUT: %Convert.16d: %Convert.type.ed5 = struct_value () [concrete]
// CHECK:STDOUT: %ImplicitAs.facet: %ImplicitAs.type.9ba = facet_value Core.IntLiteral, (%ImplicitAs.impl_witness.e34) [concrete]
// CHECK:STDOUT: %.d6a: type = fn_type_with_self_type %Convert.type.6da, %ImplicitAs.facet [concrete]
// CHECK:STDOUT: %Convert.bound.43e: <bound method> = bound_method %int_1.5b8, %Convert.16d [concrete]
// CHECK:STDOUT: %Convert.specific_fn: <specific function> = specific_function %Convert.16d, @Convert.2(%int_32) [concrete]
// CHECK:STDOUT: %bound_method.947: <bound method> = bound_method %int_1.5b8, %Convert.specific_fn [concrete]
// CHECK:STDOUT: %int_1.47b: %i32 = int_value 1 [concrete]
// CHECK:STDOUT: %Field.val: %Field = struct_value (%int_1.47b) [concrete]
// CHECK:STDOUT: %Field.elem: type = unbound_element_type %Field, %i32 [concrete]
// CHECK:STDOUT: %int_2.ecc: Core.IntLiteral = int_value 2 [concrete]
// CHECK:STDOUT: %Convert.bound.918: <bound method> = bound_method %int_2.ecc, %Convert.16d [concrete]
// CHECK:STDOUT: %bound_method.c74: <bound method> = bound_method %int_2.ecc, %Convert.specific_fn [concrete]
// CHECK:STDOUT: %int_2.d0d: %i32 = int_value 2 [concrete]
// CHECK:STDOUT: %ForwardDeclared.7b34f2.1: type = class_type @ForwardDeclared.1 [concrete]
// CHECK:STDOUT: %ForwardDeclared.val: %ForwardDeclared.7b34f2.1 = struct_value () [concrete]
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: %G.type: type = fn_type @G [concrete]
// CHECK:STDOUT: %G: %G.type = struct_value () [concrete]
// CHECK:STDOUT: %ptr.6cf: type = ptr_type %ForwardDeclared.7b34f2.1 [concrete]
// CHECK:STDOUT: %Incomplete: type = class_type @Incomplete [concrete]
// CHECK:STDOUT: %ptr.c62: type = ptr_type %Incomplete [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Main.Empty: type = import_ref Main//a, Empty, loaded [concrete = constants.%Empty]
// CHECK:STDOUT: %Main.Field: type = import_ref Main//a, Field, loaded [concrete = constants.%Field]
// CHECK:STDOUT: %Main.ForwardDeclared: type = import_ref Main//a, ForwardDeclared, loaded [concrete = constants.%ForwardDeclared.7b34f2.1]
// CHECK:STDOUT: %Main.Incomplete: type = import_ref Main//a, Incomplete, loaded [concrete = constants.%Incomplete]
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: .ImplicitAs = %Core.ImplicitAs
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Main.import_ref.8f24d3.1: <witness> = import_ref Main//a, loc5_1, loaded [concrete = constants.%complete_type.357]
// CHECK:STDOUT: %Main.import_ref.fd7 = import_ref Main//a, inst18 [no loc], unloaded
// CHECK:STDOUT: %Main.import_ref.709: <witness> = import_ref Main//a, loc9_1, loaded [concrete = constants.%complete_type.c07]
// CHECK:STDOUT: %Main.import_ref.845 = import_ref Main//a, inst24 [no loc], unloaded
// CHECK:STDOUT: %Main.import_ref.4d2: %Field.elem = import_ref Main//a, loc8_8, loaded [concrete = %.d33]
// CHECK:STDOUT: %Main.import_ref.8f24d3.2: <witness> = import_ref Main//a, loc16_1, loaded [concrete = constants.%complete_type.357]
// CHECK:STDOUT: %Main.import_ref.39e731.1 = import_ref Main//a, inst63 [no loc], unloaded
// CHECK:STDOUT: %Main.import_ref.760: %F.type = import_ref Main//a, loc14_21, loaded [concrete = constants.%F]
// CHECK:STDOUT: %Main.import_ref.26e: %G.type = import_ref Main//a, loc15_27, loaded [concrete = constants.%G]
// CHECK:STDOUT: %Main.import_ref.8f24d3.3: <witness> = import_ref Main//a, loc16_1, loaded [concrete = constants.%complete_type.357]
// CHECK:STDOUT: %Main.import_ref.39e731.2 = import_ref Main//a, inst63 [no loc], unloaded
// CHECK:STDOUT: %Main.import_ref.42a = import_ref Main//a, loc14_21, unloaded
// CHECK:STDOUT: %Main.import_ref.67a = import_ref Main//a, loc15_27, unloaded
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Empty = imports.%Main.Empty
// CHECK:STDOUT: .Field = imports.%Main.Field
// CHECK:STDOUT: .ForwardDeclared = imports.%Main.ForwardDeclared
// CHECK:STDOUT: .Incomplete = imports.%Main.Incomplete
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: .Run = %Run.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %default.import = import <none>
// CHECK:STDOUT: %Run.decl: %Run.type = fn_decl @Run [concrete = constants.%Run] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Empty [from "a.carbon"] {
// CHECK:STDOUT: complete_type_witness = imports.%Main.import_ref.8f24d3.1
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = imports.%Main.import_ref.fd7
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Field [from "a.carbon"] {
// CHECK:STDOUT: complete_type_witness = imports.%Main.import_ref.709
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = imports.%Main.import_ref.845
// CHECK:STDOUT: .x = imports.%Main.import_ref.4d2
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @ForwardDeclared.1 [from "a.carbon"] {
// CHECK:STDOUT: complete_type_witness = imports.%Main.import_ref.8f24d3.2
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = imports.%Main.import_ref.39e731.1
// CHECK:STDOUT: .F = imports.%Main.import_ref.760
// CHECK:STDOUT: .G = imports.%Main.import_ref.26e
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @ForwardDeclared.2 [from "a.carbon"] {
// CHECK:STDOUT: complete_type_witness = imports.%Main.import_ref.8f24d3.3
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = imports.%Main.import_ref.39e731.2
// CHECK:STDOUT: .F = imports.%Main.import_ref.42a
// CHECK:STDOUT: .G = imports.%Main.import_ref.67a
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Incomplete [from "a.carbon"];
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Run() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %a.patt: %Empty = binding_pattern a
// CHECK:STDOUT: %.loc7_3.1: %Empty = var_pattern %a.patt
// CHECK:STDOUT: }
// CHECK:STDOUT: %a.var: ref %Empty = var a
// CHECK:STDOUT: %.loc7_19.1: %empty_struct_type = struct_literal ()
// CHECK:STDOUT: %.loc7_19.2: init %Empty = class_init (), %a.var [concrete = constants.%Empty.val]
// CHECK:STDOUT: %.loc7_3.2: init %Empty = converted %.loc7_19.1, %.loc7_19.2 [concrete = constants.%Empty.val]
// CHECK:STDOUT: assign %a.var, %.loc7_3.2
// CHECK:STDOUT: %Empty.ref: type = name_ref Empty, imports.%Main.Empty [concrete = constants.%Empty]
// CHECK:STDOUT: %a: ref %Empty = bind_name a, %a.var
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %b.patt: %Field = binding_pattern b
// CHECK:STDOUT: %.loc9_3.1: %Field = var_pattern %b.patt
// CHECK:STDOUT: }
// CHECK:STDOUT: %b.var: ref %Field = var b
// CHECK:STDOUT: %int_1: Core.IntLiteral = int_value 1 [concrete = constants.%int_1.5b8]
// CHECK:STDOUT: %.loc9_25.1: %struct_type.x.c96 = struct_literal (%int_1)
// CHECK:STDOUT: %impl.elem0.loc9: %.d6a = impl_witness_access constants.%ImplicitAs.impl_witness.e34, element0 [concrete = constants.%Convert.16d]
// CHECK:STDOUT: %bound_method.loc9_25.1: <bound method> = bound_method %int_1, %impl.elem0.loc9 [concrete = constants.%Convert.bound.43e]
// CHECK:STDOUT: %specific_fn.loc9: <specific function> = specific_function %impl.elem0.loc9, @Convert.2(constants.%int_32) [concrete = constants.%Convert.specific_fn]
// CHECK:STDOUT: %bound_method.loc9_25.2: <bound method> = bound_method %int_1, %specific_fn.loc9 [concrete = constants.%bound_method.947]
// CHECK:STDOUT: %int.convert_checked.loc9: init %i32 = call %bound_method.loc9_25.2(%int_1) [concrete = constants.%int_1.47b]
// CHECK:STDOUT: %.loc9_25.2: init %i32 = converted %int_1, %int.convert_checked.loc9 [concrete = constants.%int_1.47b]
// CHECK:STDOUT: %.loc9_25.3: ref %i32 = class_element_access %b.var, element0
// CHECK:STDOUT: %.loc9_25.4: init %i32 = initialize_from %.loc9_25.2 to %.loc9_25.3 [concrete = constants.%int_1.47b]
// CHECK:STDOUT: %.loc9_25.5: init %Field = class_init (%.loc9_25.4), %b.var [concrete = constants.%Field.val]
// CHECK:STDOUT: %.loc9_3.2: init %Field = converted %.loc9_25.1, %.loc9_25.5 [concrete = constants.%Field.val]
// CHECK:STDOUT: assign %b.var, %.loc9_3.2
// CHECK:STDOUT: %Field.ref: type = name_ref Field, imports.%Main.Field [concrete = constants.%Field]
// CHECK:STDOUT: %b: ref %Field = bind_name b, %b.var
// CHECK:STDOUT: %b.ref: ref %Field = name_ref b, %b
// CHECK:STDOUT: %x.ref: %Field.elem = name_ref x, imports.%Main.import_ref.4d2 [concrete = imports.%.d33]
// CHECK:STDOUT: %.loc10_4: ref %i32 = class_element_access %b.ref, element0
// CHECK:STDOUT: %int_2: Core.IntLiteral = int_value 2 [concrete = constants.%int_2.ecc]
// CHECK:STDOUT: %impl.elem0.loc10: %.d6a = impl_witness_access constants.%ImplicitAs.impl_witness.e34, element0 [concrete = constants.%Convert.16d]
// CHECK:STDOUT: %bound_method.loc10_7.1: <bound method> = bound_method %int_2, %impl.elem0.loc10 [concrete = constants.%Convert.bound.918]
// CHECK:STDOUT: %specific_fn.loc10: <specific function> = specific_function %impl.elem0.loc10, @Convert.2(constants.%int_32) [concrete = constants.%Convert.specific_fn]
// CHECK:STDOUT: %bound_method.loc10_7.2: <bound method> = bound_method %int_2, %specific_fn.loc10 [concrete = constants.%bound_method.c74]
// CHECK:STDOUT: %int.convert_checked.loc10: init %i32 = call %bound_method.loc10_7.2(%int_2) [concrete = constants.%int_2.d0d]
// CHECK:STDOUT: %.loc10_7: init %i32 = converted %int_2, %int.convert_checked.loc10 [concrete = constants.%int_2.d0d]
// CHECK:STDOUT: assign %.loc10_4, %.loc10_7
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %c.patt: %ForwardDeclared.7b34f2.1 = binding_pattern c
// CHECK:STDOUT: %.loc12_3.1: %ForwardDeclared.7b34f2.1 = var_pattern %c.patt
// CHECK:STDOUT: }
// CHECK:STDOUT: %c.var: ref %ForwardDeclared.7b34f2.1 = var c
// CHECK:STDOUT: %.loc12_29.1: %empty_struct_type = struct_literal ()
// CHECK:STDOUT: %.loc12_29.2: init %ForwardDeclared.7b34f2.1 = class_init (), %c.var [concrete = constants.%ForwardDeclared.val]
// CHECK:STDOUT: %.loc12_3.2: init %ForwardDeclared.7b34f2.1 = converted %.loc12_29.1, %.loc12_29.2 [concrete = constants.%ForwardDeclared.val]
// CHECK:STDOUT: assign %c.var, %.loc12_3.2
// CHECK:STDOUT: %ForwardDeclared.ref.loc12: type = name_ref ForwardDeclared, imports.%Main.ForwardDeclared [concrete = constants.%ForwardDeclared.7b34f2.1]
// CHECK:STDOUT: %c: ref %ForwardDeclared.7b34f2.1 = bind_name c, %c.var
// CHECK:STDOUT: %c.ref.loc13: ref %ForwardDeclared.7b34f2.1 = name_ref c, %c
// CHECK:STDOUT: %F.ref: %F.type = name_ref F, imports.%Main.import_ref.760 [concrete = constants.%F]
// CHECK:STDOUT: %F.bound: <bound method> = bound_method %c.ref.loc13, %F.ref
// CHECK:STDOUT: %.loc13: %ForwardDeclared.7b34f2.1 = bind_value %c.ref.loc13
// CHECK:STDOUT: %F.call: init %empty_tuple.type = call %F.bound(%.loc13)
// CHECK:STDOUT: %c.ref.loc14: ref %ForwardDeclared.7b34f2.1 = name_ref c, %c
// CHECK:STDOUT: %G.ref: %G.type = name_ref G, imports.%Main.import_ref.26e [concrete = constants.%G]
// CHECK:STDOUT: %G.bound: <bound method> = bound_method %c.ref.loc14, %G.ref
// CHECK:STDOUT: %addr.loc14: %ptr.6cf = addr_of %c.ref.loc14
// CHECK:STDOUT: %G.call: init %empty_tuple.type = call %G.bound(%addr.loc14)
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %d.patt: %ptr.6cf = binding_pattern d
// CHECK:STDOUT: %.loc16_3: %ptr.6cf = var_pattern %d.patt
// CHECK:STDOUT: }
// CHECK:STDOUT: %d.var: ref %ptr.6cf = var d
// CHECK:STDOUT: %c.ref.loc16: ref %ForwardDeclared.7b34f2.1 = name_ref c, %c
// CHECK:STDOUT: %addr.loc16: %ptr.6cf = addr_of %c.ref.loc16
// CHECK:STDOUT: assign %d.var, %addr.loc16
// CHECK:STDOUT: %.loc16_25: type = splice_block %ptr.loc16 [concrete = constants.%ptr.6cf] {
// CHECK:STDOUT: %ForwardDeclared.ref.loc16: type = name_ref ForwardDeclared, imports.%Main.ForwardDeclared [concrete = constants.%ForwardDeclared.7b34f2.1]
// CHECK:STDOUT: %ptr.loc16: type = ptr_type %ForwardDeclared.ref.loc16 [concrete = constants.%ptr.6cf]
// CHECK:STDOUT: }
// CHECK:STDOUT: %d: ref %ptr.6cf = bind_name d, %d.var
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %e.patt: %ptr.c62 = binding_pattern e
// CHECK:STDOUT: %.loc18_3: %ptr.c62 = var_pattern %e.patt
// CHECK:STDOUT: }
// CHECK:STDOUT: %e.var: ref %ptr.c62 = var e
// CHECK:STDOUT: %.loc18_20: type = splice_block %ptr.loc18 [concrete = constants.%ptr.c62] {
// CHECK:STDOUT: %Incomplete.ref: type = name_ref Incomplete, imports.%Main.Incomplete [concrete = constants.%Incomplete]
// CHECK:STDOUT: %ptr.loc18: type = ptr_type %Incomplete.ref [concrete = constants.%ptr.c62]
// CHECK:STDOUT: }
// CHECK:STDOUT: %e: ref %ptr.c62 = bind_name e, %e.var
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F[%self.param_patt: %ForwardDeclared.7b34f2.1]() [from "a.carbon"];
// CHECK:STDOUT:
// CHECK:STDOUT: fn @G[addr <unexpected>.inst1161: %ptr.6cf]() [from "a.carbon"];
// CHECK:STDOUT:
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