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carbon-lang/toolchain/check/testdata/interop/cpp/template/template_template_param.carbon
T
Geoff RomerandRichard Smith e023f75254 Implement thunking in terms of constant evaluation (#7332) 
The bulk of this change is changing most pattern insts to be `Always`
rather than `AlwaysUnique` constants, so that they can be wrapped in
`SpecificConstant`s to perform substitution. That then lets thunking
rely much more on `SpecificConstant` wrappers instead of deep-copying
the inst tree with modified types.

This approach to thunking should scale better, particularly as things
like form generics make function signatures more complex, because we can
leverage the existing support for constant evaluation and substitution.
Unfortunately, applying this approach to binding patterns will require
more work; see the TODO near the top of `thunk.cpp` for details.

---------

Co-authored-by: Richard Smith <richard@metafoo.co.uk>
2026-06-13 00:22:00 +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/interop/cpp/template/template_template_param.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interop/cpp/template/template_template_param.carbon
// --- templates.h
template<typename> struct A {};
template<typename> struct B {};
template<typename, typename> struct C {};
template<template<typename> typename, template<typename> typename>
struct TwoTemplates {};
// --- valid.carbon
library "[[@TEST_NAME]]";
import Cpp library "templates.h";
//@dump-sem-ir-begin
var x: Cpp.TwoTemplates(Cpp.A, Cpp.B);
//@dump-sem-ir-end
// --- fail_template_mismatch.carbon
library "[[@TEST_NAME]]";
import Cpp library "templates.h";
//@dump-sem-ir-begin
// CHECK:STDERR: fail_template_mismatch.carbon:[[@LINE+15]]:35: error: too few template arguments for class template 'C' [CppInteropParseError]
// CHECK:STDERR: 22 | var x: Cpp.TwoTemplates(Cpp.A, Cpp.C);
// CHECK:STDERR: | ^
// CHECK:STDERR: fail_template_mismatch.carbon:[[@LINE+12]]:35: note: template template argument has different template parameters than its corresponding template template parameter [CppInteropParseNote]
// CHECK:STDERR: 22 | var x: Cpp.TwoTemplates(Cpp.A, Cpp.C);
// CHECK:STDERR: | ^
// CHECK:STDERR: fail_template_mismatch.carbon:[[@LINE-9]]:10: in file included here [InCppInclude]
// CHECK:STDERR: ./templates.h:6:66: note: previous template template parameter is here [CppInteropParseNote]
// CHECK:STDERR: 6 | template<template<typename> typename, template<typename> typename>
// CHECK:STDERR: | ~~~~~~~~~~~~~~~~~~ ^
// CHECK:STDERR: fail_template_mismatch.carbon:[[@LINE-13]]:10: in file included here [InCppInclude]
// CHECK:STDERR: ./templates.h:4:37: note: template is declared here [CppInteropParseNote]
// CHECK:STDERR: 4 | template<typename, typename> struct C {};
// CHECK:STDERR: | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^
// CHECK:STDERR:
var x: Cpp.TwoTemplates(Cpp.A, Cpp.C);
//@dump-sem-ir-end
// --- fail_type_argument.carbon
library "[[@TEST_NAME]]";
import Cpp library "templates.h";
class X {}
// CHECK:STDERR: fail_type_argument.carbon:[[@LINE+4]]:32: error: template argument for template template parameter must be a class template or type alias template [CppInteropParseError]
// CHECK:STDERR: 12 | var x: Cpp.TwoTemplates(Cpp.A, X);
// CHECK:STDERR: | ^
// CHECK:STDERR:
var x: Cpp.TwoTemplates(Cpp.A, X);
// --- fail_non_type_argument.carbon
library "[[@TEST_NAME]]";
import Cpp library "templates.h";
// CHECK:STDERR: fail_non_type_argument.carbon:[[@LINE+4]]:32: error: template argument for template template parameter must be a class template or type alias template [CppInteropParseError]
// CHECK:STDERR: 10 | var x: Cpp.TwoTemplates(Cpp.A, true);
// CHECK:STDERR: | ^
// CHECK:STDERR:
var x: Cpp.TwoTemplates(Cpp.A, true);
// CHECK:STDOUT: --- valid.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %TwoTemplates: type = class_type @TwoTemplates [concrete]
// CHECK:STDOUT: %pattern_type.f5e: type = pattern_type %TwoTemplates [concrete]
// CHECK:STDOUT: %x.patt: %pattern_type.f5e = ref_binding_pattern x [concrete]
// CHECK:STDOUT: %x.var_patt: %pattern_type.f5e = var_pattern %x.patt [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.type: type = facet_type <@DefaultOrUnformed> [concrete]
// CHECK:STDOUT: %Default.type: type = facet_type <@Default> [concrete]
// CHECK:STDOUT: %T.b09: %Default.type = symbolic_binding T, 0 [symbolic]
// CHECK:STDOUT: %T.as_type.as.DefaultOrUnformed.impl.Op.type.0c9: type = fn_type @T.as_type.as.DefaultOrUnformed.impl.Op, @T.as_type.as.DefaultOrUnformed.impl(%T.b09) [symbolic]
// CHECK:STDOUT: %T.as_type.as.DefaultOrUnformed.impl.Op.cfe: %T.as_type.as.DefaultOrUnformed.impl.Op.type.0c9 = struct_value () [symbolic]
// CHECK:STDOUT: %TwoTemplates.Op.type: type = fn_type @TwoTemplates.Op [concrete]
// CHECK:STDOUT: %TwoTemplates.Op: %TwoTemplates.Op.type = struct_value () [concrete]
// CHECK:STDOUT: %custom_witness.9b4: <witness> = custom_witness (%TwoTemplates.Op), @Default [concrete]
// CHECK:STDOUT: %Default.facet.e75: %Default.type = facet_value %TwoTemplates, (%custom_witness.9b4) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness.c67: <witness> = impl_witness imports.%DefaultOrUnformed.impl_witness_table.670, @T.as_type.as.DefaultOrUnformed.impl(%Default.facet.e75) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value %TwoTemplates, (%DefaultOrUnformed.impl_witness.c67) [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core.import_ref.c2f: @T.as_type.as.DefaultOrUnformed.impl.%T.as_type.as.DefaultOrUnformed.impl.Op.type (%T.as_type.as.DefaultOrUnformed.impl.Op.type.0c9) = import_ref Core//prelude/parts/default, loc{{\d+_\d+}}, loaded [symbolic = @T.as_type.as.DefaultOrUnformed.impl.%T.as_type.as.DefaultOrUnformed.impl.Op (constants.%T.as_type.as.DefaultOrUnformed.impl.Op.cfe)]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness_table.670 = impl_witness_table (%Core.import_ref.c2f), @T.as_type.as.DefaultOrUnformed.impl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %x.patt: %pattern_type.f5e = ref_binding_pattern x [concrete = constants.%x.patt]
// CHECK:STDOUT: %x.var_patt: %pattern_type.f5e = var_pattern %x.patt [concrete = constants.%x.var_patt]
// CHECK:STDOUT: }
// CHECK:STDOUT: %x.var: ref %TwoTemplates = var %x.var_patt [concrete]
// CHECK:STDOUT: %x: ref %TwoTemplates = ref_binding x, %x.var [concrete = %x.var]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @__global_init() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value constants.%TwoTemplates, (constants.%DefaultOrUnformed.impl_witness.c67) [concrete = constants.%DefaultOrUnformed.facet]
// CHECK:STDOUT: %.loc7_38.1: %DefaultOrUnformed.type = converted constants.%TwoTemplates, %DefaultOrUnformed.facet [concrete = constants.%DefaultOrUnformed.facet]
// CHECK:STDOUT: %as_type: type = facet_access_type %.loc7_38.1 [concrete = constants.%TwoTemplates]
// CHECK:STDOUT: %.loc7_38.2: type = converted %.loc7_38.1, %as_type [concrete = constants.%TwoTemplates]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %.loc7_1: ref %TwoTemplates = splice_block file.%x.var [concrete = file.%x.var] {}
// CHECK:STDOUT: %T.as_type.as.DefaultOrUnformed.impl.Op.call: init %TwoTemplates to %.loc7_1 = call %T.as_type.as.DefaultOrUnformed.impl.Op.specific_fn()
// CHECK:STDOUT: assign file.%x.var, %T.as_type.as.DefaultOrUnformed.impl.Op.call
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_template_mismatch.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %x.patt: <error> = ref_binding_pattern x [concrete = <error>]
// CHECK:STDOUT: %x.var_patt: <error> = var_pattern %x.patt [concrete = <error>]
// CHECK:STDOUT: }
// CHECK:STDOUT: %x.var: ref <error> = var %x.var_patt [concrete = <error>]
// CHECK:STDOUT: %x: ref <error> = ref_binding x, <error> [concrete = <error>]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @__global_init() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: assign file.%x.var, <error>
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
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