carbon-lang/toolchain/check/testdata/interface/import.carbon

// 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
// TODO: Add ranges and switch to "--dump-sem-ir-ranges=only".
// EXTRA-ARGS: --dump-sem-ir-ranges=if-present
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/interface/import.carbon
// TIP: To dump output, run:
// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interface/import.carbon

// --- a.carbon

library "[[@TEST_NAME]]";

interface Empty {
}

interface Basic {
  let T:! type;
  fn F();
}

// TODO: Implement merging of interface on import.
// interface ForwardDeclared;

interface ForwardDeclared {
  let T:! type;
  fn F();
}

var f_ref: {.f: ForwardDeclared};

// --- b.carbon

library "[[@TEST_NAME]]";

import library "a";

fn UseEmpty(e: Empty) {}
fn UseBasic(e: Basic) {}
fn UseForwardDeclared(f: ForwardDeclared) {}

alias UseBasicT = Basic.T;
alias UseBasicF = Basic.F;

alias UseForwardDeclaredT = ForwardDeclared.T;
alias UseForwardDeclaredF = ForwardDeclared.F;

var f: ForwardDeclared* = &f_ref.f;

// CHECK:STDOUT: --- a.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %Empty.type: type = facet_type <@Empty> [concrete]
// CHECK:STDOUT:   %Self.2a7: %Empty.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT:   %Basic.type: type = facet_type <@Basic> [concrete]
// CHECK:STDOUT:   %Self.ead: %Basic.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT:   %Basic.assoc_type: type = assoc_entity_type @Basic [concrete]
// CHECK:STDOUT:   %assoc0.0d9: %Basic.assoc_type = assoc_entity element0, @Basic.%T [concrete]
// CHECK:STDOUT:   %Basic.F.type: type = fn_type @Basic.F [concrete]
// CHECK:STDOUT:   %Basic.F: %Basic.F.type = struct_value () [concrete]
// CHECK:STDOUT:   %assoc1.9b4: %Basic.assoc_type = assoc_entity element1, @Basic.%Basic.F.decl [concrete]
// CHECK:STDOUT:   %ForwardDeclared.type: type = facet_type <@ForwardDeclared> [concrete]
// CHECK:STDOUT:   %Self.0f5: %ForwardDeclared.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT:   %ForwardDeclared.assoc_type: type = assoc_entity_type @ForwardDeclared [concrete]
// CHECK:STDOUT:   %assoc0.27c: %ForwardDeclared.assoc_type = assoc_entity element0, @ForwardDeclared.%T [concrete]
// CHECK:STDOUT:   %ForwardDeclared.F.type: type = fn_type @ForwardDeclared.F [concrete]
// CHECK:STDOUT:   %ForwardDeclared.F: %ForwardDeclared.F.type = struct_value () [concrete]
// CHECK:STDOUT:   %assoc1.c80: %ForwardDeclared.assoc_type = assoc_entity element1, @ForwardDeclared.%ForwardDeclared.F.decl [concrete]
// CHECK:STDOUT:   %struct_type.f: type = struct_type {.f: %ForwardDeclared.type} [concrete]
// CHECK:STDOUT:   %pattern_type: type = pattern_type %struct_type.f [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
// 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:     .Basic = %Basic.decl
// CHECK:STDOUT:     .ForwardDeclared = %ForwardDeclared.decl
// CHECK:STDOUT:     .f_ref = %f_ref
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %Core.import = import Core
// CHECK:STDOUT:   %Empty.decl: type = interface_decl @Empty [concrete = constants.%Empty.type] {} {}
// CHECK:STDOUT:   %Basic.decl: type = interface_decl @Basic [concrete = constants.%Basic.type] {} {}
// CHECK:STDOUT:   %ForwardDeclared.decl: type = interface_decl @ForwardDeclared [concrete = constants.%ForwardDeclared.type] {} {}
// CHECK:STDOUT:   name_binding_decl {
// CHECK:STDOUT:     %f_ref.patt: %pattern_type = ref_binding_pattern f_ref [concrete]
// CHECK:STDOUT:     %f_ref.var_patt: %pattern_type = var_pattern %f_ref.patt [concrete]
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %f_ref.var: ref %struct_type.f = var %f_ref.var_patt [concrete]
// CHECK:STDOUT:   %.loc20: type = splice_block %struct_type.f [concrete = constants.%struct_type.f] {
// CHECK:STDOUT:     %ForwardDeclared.ref: type = name_ref ForwardDeclared, %ForwardDeclared.decl [concrete = constants.%ForwardDeclared.type]
// CHECK:STDOUT:     %struct_type.f: type = struct_type {.f: %ForwardDeclared.type} [concrete = constants.%struct_type.f]
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %f_ref: ref %struct_type.f = ref_binding f_ref, %f_ref.var [concrete = %f_ref.var]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @Empty {
// CHECK:STDOUT:   %Self: %Empty.type = symbolic_binding Self, 0 [symbolic = constants.%Self.2a7]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT:   .Self = %Self
// CHECK:STDOUT:   witness = ()
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @Basic {
// CHECK:STDOUT:   %Self: %Basic.type = symbolic_binding Self, 0 [symbolic = constants.%Self.ead]
// CHECK:STDOUT:   %T: type = assoc_const_decl @T.loc8 [concrete] {
// CHECK:STDOUT:     %assoc0: %Basic.assoc_type = assoc_entity element0, @Basic.%T [concrete = constants.%assoc0.0d9]
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %Basic.F.decl: %Basic.F.type = fn_decl @Basic.F [concrete = constants.%Basic.F] {} {}
// CHECK:STDOUT:   %assoc1: %Basic.assoc_type = assoc_entity element1, %Basic.F.decl [concrete = constants.%assoc1.9b4]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT:   .Self = %Self
// CHECK:STDOUT:   .T = @T.loc8.%assoc0
// CHECK:STDOUT:   .F = %assoc1
// CHECK:STDOUT:   witness = (%T, %Basic.F.decl)
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @ForwardDeclared {
// CHECK:STDOUT:   %Self: %ForwardDeclared.type = symbolic_binding Self, 0 [symbolic = constants.%Self.0f5]
// CHECK:STDOUT:   %T: type = assoc_const_decl @T.loc16 [concrete] {
// CHECK:STDOUT:     %assoc0: %ForwardDeclared.assoc_type = assoc_entity element0, @ForwardDeclared.%T [concrete = constants.%assoc0.27c]
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %ForwardDeclared.F.decl: %ForwardDeclared.F.type = fn_decl @ForwardDeclared.F [concrete = constants.%ForwardDeclared.F] {} {}
// CHECK:STDOUT:   %assoc1: %ForwardDeclared.assoc_type = assoc_entity element1, %ForwardDeclared.F.decl [concrete = constants.%assoc1.c80]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT:   .Self = %Self
// CHECK:STDOUT:   .T = @T.loc16.%assoc0
// CHECK:STDOUT:   .F = %assoc1
// CHECK:STDOUT:   witness = (%T, %ForwardDeclared.F.decl)
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic assoc_const @T.loc8(@Basic.%Self: %Basic.type) {
// CHECK:STDOUT:   assoc_const T:! type;
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic assoc_const @T.loc16(@ForwardDeclared.%Self: %ForwardDeclared.type) {
// CHECK:STDOUT:   assoc_const T:! type;
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @Basic.F(@Basic.%Self: %Basic.type) {
// CHECK:STDOUT:   fn();
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @ForwardDeclared.F(@ForwardDeclared.%Self: %ForwardDeclared.type) {
// CHECK:STDOUT:   fn();
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @T.loc8(constants.%Self.ead) {}
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Basic.F(constants.%Self.ead) {}
// CHECK:STDOUT:
// CHECK:STDOUT: specific @T.loc16(constants.%Self.0f5) {}
// CHECK:STDOUT:
// CHECK:STDOUT: specific @ForwardDeclared.F(constants.%Self.0f5) {}
// CHECK:STDOUT:
// CHECK:STDOUT: --- b.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %Empty.type: type = facet_type <@Empty> [concrete]
// CHECK:STDOUT:   %pattern_type.639: type = pattern_type %Empty.type [concrete]
// CHECK:STDOUT:   %UseEmpty.type: type = fn_type @UseEmpty [concrete]
// CHECK:STDOUT:   %UseEmpty: %UseEmpty.type = struct_value () [concrete]
// CHECK:STDOUT:   %Basic.type: type = facet_type <@Basic> [concrete]
// CHECK:STDOUT:   %pattern_type.2b6: type = pattern_type %Basic.type [concrete]
// CHECK:STDOUT:   %UseBasic.type: type = fn_type @UseBasic [concrete]
// CHECK:STDOUT:   %UseBasic: %UseBasic.type = struct_value () [concrete]
// CHECK:STDOUT:   %ForwardDeclared.type: type = facet_type <@ForwardDeclared> [concrete]
// CHECK:STDOUT:   %pattern_type.71a: type = pattern_type %ForwardDeclared.type [concrete]
// CHECK:STDOUT:   %UseForwardDeclared.type: type = fn_type @UseForwardDeclared [concrete]
// CHECK:STDOUT:   %UseForwardDeclared: %UseForwardDeclared.type = struct_value () [concrete]
// CHECK:STDOUT:   %Basic.assoc_type: type = assoc_entity_type @Basic [concrete]
// CHECK:STDOUT:   %assoc0.fee: %Basic.assoc_type = assoc_entity element0, imports.%Main.import_ref.a4a [concrete]
// CHECK:STDOUT:   %assoc1.4ea: %Basic.assoc_type = assoc_entity element1, imports.%Main.import_ref.0be [concrete]
// CHECK:STDOUT:   %ForwardDeclared.assoc_type: type = assoc_entity_type @ForwardDeclared [concrete]
// CHECK:STDOUT:   %assoc0.d40: %ForwardDeclared.assoc_type = assoc_entity element0, imports.%Main.import_ref.69a [concrete]
// CHECK:STDOUT:   %assoc1.e3d: %ForwardDeclared.assoc_type = assoc_entity element1, imports.%Main.import_ref.1cc [concrete]
// CHECK:STDOUT:   %ptr.f78: type = ptr_type %ForwardDeclared.type [concrete]
// CHECK:STDOUT:   %pattern_type.aa9: type = pattern_type %ptr.f78 [concrete]
// CHECK:STDOUT:   %struct_type.f: type = struct_type {.f: %ForwardDeclared.type} [concrete]
// CHECK:STDOUT:   %pattern_type.1e8: type = pattern_type %struct_type.f [concrete]
// CHECK:STDOUT:   %.d5e: ref %ForwardDeclared.type = struct_access imports.%f_ref.var, element0 [concrete]
// CHECK:STDOUT:   %addr: %ptr.f78 = addr_of %.d5e [concrete]
// CHECK:STDOUT:   %Copy.type: type = facet_type <@Copy> [concrete]
// CHECK:STDOUT:   %Copy.Op.type: type = fn_type @Copy.Op [concrete]
// CHECK:STDOUT:   %T.d9f: type = symbolic_binding T, 0 [symbolic]
// CHECK:STDOUT:   %ptr.as.Copy.impl.Op.type.75b: type = fn_type @ptr.as.Copy.impl.Op, @ptr.as.Copy.impl(%T.d9f) [symbolic]
// CHECK:STDOUT:   %ptr.as.Copy.impl.Op.692: %ptr.as.Copy.impl.Op.type.75b = struct_value () [symbolic]
// CHECK:STDOUT:   %Copy.impl_witness.e1f: <witness> = impl_witness imports.%Copy.impl_witness_table.67d, @ptr.as.Copy.impl(%ForwardDeclared.type) [concrete]
// CHECK:STDOUT:   %ptr.as.Copy.impl.Op.type.594: type = fn_type @ptr.as.Copy.impl.Op, @ptr.as.Copy.impl(%ForwardDeclared.type) [concrete]
// CHECK:STDOUT:   %ptr.as.Copy.impl.Op.382: %ptr.as.Copy.impl.Op.type.594 = struct_value () [concrete]
// CHECK:STDOUT:   %Copy.facet: %Copy.type = facet_value %ptr.f78, (%Copy.impl_witness.e1f) [concrete]
// CHECK:STDOUT:   %.afe: type = fn_type_with_self_type %Copy.Op.type, %Copy.facet [concrete]
// CHECK:STDOUT:   %ptr.as.Copy.impl.Op.bound: <bound method> = bound_method %addr, %ptr.as.Copy.impl.Op.382 [concrete]
// CHECK:STDOUT:   %ptr.as.Copy.impl.Op.specific_fn: <specific function> = specific_function %ptr.as.Copy.impl.Op.382, @ptr.as.Copy.impl.Op(%ForwardDeclared.type) [concrete]
// CHECK:STDOUT:   %bound_method: <bound method> = bound_method %addr, %ptr.as.Copy.impl.Op.specific_fn [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT:   %Main.Empty: type = import_ref Main//a, Empty, loaded [concrete = constants.%Empty.type]
// CHECK:STDOUT:   %Main.Basic: type = import_ref Main//a, Basic, loaded [concrete = constants.%Basic.type]
// CHECK:STDOUT:   %Main.ForwardDeclared: type = import_ref Main//a, ForwardDeclared, loaded [concrete = constants.%ForwardDeclared.type]
// CHECK:STDOUT:   %Main.f_ref: ref %struct_type.f = import_ref Main//a, f_ref, loaded [concrete = %f_ref.var]
// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT:     .Copy = %Core.Copy
// CHECK:STDOUT:     import Core//prelude
// CHECK:STDOUT:     import Core//prelude/...
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %Main.import_ref.257 = import_ref Main//a, loc4_17, unloaded
// CHECK:STDOUT:   %Main.import_ref.58d = import_ref Main//a, loc7_17, unloaded
// CHECK:STDOUT:   %Main.import_ref.3d5: %Basic.assoc_type = import_ref Main//a, loc8_8, loaded [concrete = constants.%assoc0.fee]
// CHECK:STDOUT:   %Main.import_ref.760: %Basic.assoc_type = import_ref Main//a, loc9_9, loaded [concrete = constants.%assoc1.4ea]
// CHECK:STDOUT:   %Main.T.44f = import_ref Main//a, T, unloaded
// CHECK:STDOUT:   %Main.F.eea = import_ref Main//a, F, unloaded
// CHECK:STDOUT:   %Main.import_ref.60d = import_ref Main//a, loc15_27, unloaded
// CHECK:STDOUT:   %Main.import_ref.ad1: %ForwardDeclared.assoc_type = import_ref Main//a, loc16_8, loaded [concrete = constants.%assoc0.d40]
// CHECK:STDOUT:   %Main.import_ref.339: %ForwardDeclared.assoc_type = import_ref Main//a, loc17_9, loaded [concrete = constants.%assoc1.e3d]
// CHECK:STDOUT:   %Main.T.6ee = import_ref Main//a, T, unloaded
// CHECK:STDOUT:   %Main.F.5d0 = import_ref Main//a, F, unloaded
// CHECK:STDOUT:   %Main.import_ref.a4a = import_ref Main//a, loc8_8, unloaded
// CHECK:STDOUT:   %Main.import_ref.0be = import_ref Main//a, loc9_9, unloaded
// CHECK:STDOUT:   %Main.import_ref.69a = import_ref Main//a, loc16_8, unloaded
// CHECK:STDOUT:   %Main.import_ref.1cc = import_ref Main//a, loc17_9, unloaded
// CHECK:STDOUT:   %f_ref.patt: %pattern_type.1e8 = ref_binding_pattern f_ref [concrete]
// CHECK:STDOUT:   %f_ref.var_patt: %pattern_type.1e8 = var_pattern %f_ref.patt [concrete]
// CHECK:STDOUT:   %f_ref.var: ref %struct_type.f = var %f_ref.var_patt [concrete]
// CHECK:STDOUT:   %Core.Copy: type = import_ref Core//prelude/parts/copy, Copy, loaded [concrete = constants.%Copy.type]
// CHECK:STDOUT:   %Core.import_ref.659: @ptr.as.Copy.impl.%ptr.as.Copy.impl.Op.type (%ptr.as.Copy.impl.Op.type.75b) = import_ref Core//prelude/parts/copy, loc{{\d+_\d+}}, loaded [symbolic = @ptr.as.Copy.impl.%ptr.as.Copy.impl.Op (constants.%ptr.as.Copy.impl.Op.692)]
// CHECK:STDOUT:   %Copy.impl_witness_table.67d = impl_witness_table (%Core.import_ref.659), @ptr.as.Copy.impl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
// CHECK:STDOUT:     .Empty = imports.%Main.Empty
// CHECK:STDOUT:     .Basic = imports.%Main.Basic
// CHECK:STDOUT:     .ForwardDeclared = imports.%Main.ForwardDeclared
// CHECK:STDOUT:     .f_ref = imports.%Main.f_ref
// CHECK:STDOUT:     .Core = imports.%Core
// CHECK:STDOUT:     .UseEmpty = %UseEmpty.decl
// CHECK:STDOUT:     .UseBasic = %UseBasic.decl
// CHECK:STDOUT:     .UseForwardDeclared = %UseForwardDeclared.decl
// CHECK:STDOUT:     .UseBasicT = %UseBasicT
// CHECK:STDOUT:     .UseBasicF = %UseBasicF
// CHECK:STDOUT:     .UseForwardDeclaredT = %UseForwardDeclaredT
// CHECK:STDOUT:     .UseForwardDeclaredF = %UseForwardDeclaredF
// CHECK:STDOUT:     .f = %f
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %Core.import = import Core
// CHECK:STDOUT:   %default.import = import <none>
// CHECK:STDOUT:   %UseEmpty.decl: %UseEmpty.type = fn_decl @UseEmpty [concrete = constants.%UseEmpty] {
// CHECK:STDOUT:     %e.patt: %pattern_type.639 = value_binding_pattern e [concrete]
// CHECK:STDOUT:     %e.param_patt: %pattern_type.639 = value_param_pattern %e.patt, call_param0 [concrete]
// CHECK:STDOUT:   } {
// CHECK:STDOUT:     %e.param: %Empty.type = value_param call_param0
// CHECK:STDOUT:     %Empty.ref: type = name_ref Empty, imports.%Main.Empty [concrete = constants.%Empty.type]
// CHECK:STDOUT:     %e: %Empty.type = value_binding e, %e.param
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %UseBasic.decl: %UseBasic.type = fn_decl @UseBasic [concrete = constants.%UseBasic] {
// CHECK:STDOUT:     %e.patt: %pattern_type.2b6 = value_binding_pattern e [concrete]
// CHECK:STDOUT:     %e.param_patt: %pattern_type.2b6 = value_param_pattern %e.patt, call_param0 [concrete]
// CHECK:STDOUT:   } {
// CHECK:STDOUT:     %e.param: %Basic.type = value_param call_param0
// CHECK:STDOUT:     %Basic.ref: type = name_ref Basic, imports.%Main.Basic [concrete = constants.%Basic.type]
// CHECK:STDOUT:     %e: %Basic.type = value_binding e, %e.param
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %UseForwardDeclared.decl: %UseForwardDeclared.type = fn_decl @UseForwardDeclared [concrete = constants.%UseForwardDeclared] {
// CHECK:STDOUT:     %f.patt: %pattern_type.71a = value_binding_pattern f [concrete]
// CHECK:STDOUT:     %f.param_patt: %pattern_type.71a = value_param_pattern %f.patt, call_param0 [concrete]
// CHECK:STDOUT:   } {
// CHECK:STDOUT:     %f.param: %ForwardDeclared.type = value_param call_param0
// CHECK:STDOUT:     %ForwardDeclared.ref: type = name_ref ForwardDeclared, imports.%Main.ForwardDeclared [concrete = constants.%ForwardDeclared.type]
// CHECK:STDOUT:     %f: %ForwardDeclared.type = value_binding f, %f.param
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %Basic.ref.loc10: type = name_ref Basic, imports.%Main.Basic [concrete = constants.%Basic.type]
// CHECK:STDOUT:   %T.ref.loc10: %Basic.assoc_type = name_ref T, imports.%Main.import_ref.3d5 [concrete = constants.%assoc0.fee]
// CHECK:STDOUT:   %UseBasicT: %Basic.assoc_type = alias_binding UseBasicT, imports.%Main.import_ref.3d5 [concrete = constants.%assoc0.fee]
// CHECK:STDOUT:   %Basic.ref.loc11: type = name_ref Basic, imports.%Main.Basic [concrete = constants.%Basic.type]
// CHECK:STDOUT:   %F.ref.loc11: %Basic.assoc_type = name_ref F, imports.%Main.import_ref.760 [concrete = constants.%assoc1.4ea]
// CHECK:STDOUT:   %UseBasicF: %Basic.assoc_type = alias_binding UseBasicF, imports.%Main.import_ref.760 [concrete = constants.%assoc1.4ea]
// CHECK:STDOUT:   %ForwardDeclared.ref.loc13: type = name_ref ForwardDeclared, imports.%Main.ForwardDeclared [concrete = constants.%ForwardDeclared.type]
// CHECK:STDOUT:   %T.ref.loc13: %ForwardDeclared.assoc_type = name_ref T, imports.%Main.import_ref.ad1 [concrete = constants.%assoc0.d40]
// CHECK:STDOUT:   %UseForwardDeclaredT: %ForwardDeclared.assoc_type = alias_binding UseForwardDeclaredT, imports.%Main.import_ref.ad1 [concrete = constants.%assoc0.d40]
// CHECK:STDOUT:   %ForwardDeclared.ref.loc14: type = name_ref ForwardDeclared, imports.%Main.ForwardDeclared [concrete = constants.%ForwardDeclared.type]
// CHECK:STDOUT:   %F.ref.loc14: %ForwardDeclared.assoc_type = name_ref F, imports.%Main.import_ref.339 [concrete = constants.%assoc1.e3d]
// CHECK:STDOUT:   %UseForwardDeclaredF: %ForwardDeclared.assoc_type = alias_binding UseForwardDeclaredF, imports.%Main.import_ref.339 [concrete = constants.%assoc1.e3d]
// CHECK:STDOUT:   name_binding_decl {
// CHECK:STDOUT:     %f.patt: %pattern_type.aa9 = ref_binding_pattern f [concrete]
// CHECK:STDOUT:     %f.var_patt: %pattern_type.aa9 = var_pattern %f.patt [concrete]
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %f.var: ref %ptr.f78 = var %f.var_patt [concrete]
// CHECK:STDOUT:   %.loc16: type = splice_block %ptr [concrete = constants.%ptr.f78] {
// CHECK:STDOUT:     %ForwardDeclared.ref.loc16: type = name_ref ForwardDeclared, imports.%Main.ForwardDeclared [concrete = constants.%ForwardDeclared.type]
// CHECK:STDOUT:     %ptr: type = ptr_type %ForwardDeclared.ref.loc16 [concrete = constants.%ptr.f78]
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %f: ref %ptr.f78 = ref_binding f, %f.var [concrete = %f.var]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @Empty [from "a.carbon"] {
// CHECK:STDOUT: !members:
// CHECK:STDOUT:   .Self = imports.%Main.import_ref.257
// CHECK:STDOUT:   witness = ()
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @Basic [from "a.carbon"] {
// CHECK:STDOUT: !members:
// CHECK:STDOUT:   .Self = imports.%Main.import_ref.58d
// CHECK:STDOUT:   .T = imports.%Main.import_ref.3d5
// CHECK:STDOUT:   .F = imports.%Main.import_ref.760
// CHECK:STDOUT:   witness = (imports.%Main.T.44f, imports.%Main.F.eea)
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @ForwardDeclared [from "a.carbon"] {
// CHECK:STDOUT: !members:
// CHECK:STDOUT:   .Self = imports.%Main.import_ref.60d
// CHECK:STDOUT:   .T = imports.%Main.import_ref.ad1
// CHECK:STDOUT:   .F = imports.%Main.import_ref.339
// CHECK:STDOUT:   witness = (imports.%Main.T.6ee, imports.%Main.F.5d0)
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @UseEmpty(%e.param: %Empty.type) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT:   return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @UseBasic(%e.param: %Basic.type) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT:   return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @UseForwardDeclared(%f.param: %ForwardDeclared.type) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT:   return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @__global_init() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT:   %f_ref.ref: ref %struct_type.f = name_ref f_ref, imports.%Main.f_ref [concrete = imports.%f_ref.var]
// CHECK:STDOUT:   %.loc16: ref %ForwardDeclared.type = struct_access %f_ref.ref, element0 [concrete = constants.%.d5e]
// CHECK:STDOUT:   %addr: %ptr.f78 = addr_of %.loc16 [concrete = constants.%addr]
// CHECK:STDOUT:   %impl.elem0: %.afe = impl_witness_access constants.%Copy.impl_witness.e1f, element0 [concrete = constants.%ptr.as.Copy.impl.Op.382]
// CHECK:STDOUT:   %bound_method.loc16_27.1: <bound method> = bound_method %addr, %impl.elem0 [concrete = constants.%ptr.as.Copy.impl.Op.bound]
// CHECK:STDOUT:   %specific_fn: <specific function> = specific_function %impl.elem0, @ptr.as.Copy.impl.Op(constants.%ForwardDeclared.type) [concrete = constants.%ptr.as.Copy.impl.Op.specific_fn]
// CHECK:STDOUT:   %bound_method.loc16_27.2: <bound method> = bound_method %addr, %specific_fn [concrete = constants.%bound_method]
// CHECK:STDOUT:   %ptr.as.Copy.impl.Op.call: init %ptr.f78 = call %bound_method.loc16_27.2(%addr) [concrete = constants.%addr]
// CHECK:STDOUT:   assign file.%f.var, %ptr.as.Copy.impl.Op.call
// CHECK:STDOUT:   return
// CHECK:STDOUT: }
// CHECK:STDOUT: