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carbon-lang/toolchain/check/testdata/alias/basics.carbon
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Richard Smith cefa0397bb More fixes to package and library fingerprinting. (#7297) 
Fix import logic to make all imported packages be children of the
`NameScopeId::Package` scope. Previously, indirectly-imported packages
would end up as children of their importing package's scope, which
resulted in them not being treated as packages at all, and in particular
not being fingerprinted as packages.

Fixing that caused a failure in the fingerprinting logic as we started
to encounter packages with no correspoding import scopes. Instead of
looking for import scopes, use a simpler mechanism to map packages to
their package names, and clean up.

Unfortunately the latter change churns all the fingerprints again :(
Hopefully this is the last time for a while.
2026-06-04 17:41:46 +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/alias/basics.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/alias/basics.carbon
// --- alias.carbon
library "[[@TEST_NAME]]";
class C {};
//@dump-sem-ir-begin
alias c = C;
//@dump-sem-ir-end
let l: c = {};
// --- alias_of_alias.carbon
library "[[@TEST_NAME]]";
class C {}
//@dump-sem-ir-begin
alias a = C;
alias b = a;
alias c = b;
let d: c = {};
//@dump-sem-ir-end
// --- alias_to_generic.carbon
library "[[@TEST_NAME]]";
class A(T:! type) {}
//@dump-sem-ir-begin
alias a = A({});
//@dump-sem-ir-end
let v: a = {} as A({});
// --- fail_control_flow.carbon
library "[[@TEST_NAME]]";
// CHECK:STDERR: fail_control_flow.carbon:[[@LINE+8]]:11: error: semantics TODO: `Control flow expressions are currently only supported inside functions.` [SemanticsTodo]
// CHECK:STDERR: alias a = true or false;
// CHECK:STDERR: ^~~~~~~
// CHECK:STDERR:
// CHECK:STDERR: fail_control_flow.carbon:[[@LINE+4]]:11: error: semantics TODO: `Control flow expressions are currently only supported inside functions.` [SemanticsTodo]
// CHECK:STDERR: alias a = true or false;
// CHECK:STDERR: ^~~~~~~~~~~~~
// CHECK:STDERR:
alias a = true or false;
// --- fail_name_conflict.carbon
library "[[@TEST_NAME]]";
class C {}
alias a = C;
// CHECK:STDERR: fail_name_conflict.carbon:[[@LINE+7]]:5: error: duplicate name `a` being declared in the same scope [NameDeclDuplicate]
// CHECK:STDERR: var a: C = {};
// CHECK:STDERR: ^
// CHECK:STDERR: fail_name_conflict.carbon:[[@LINE-4]]:7: note: name is previously declared here [NameDeclPrevious]
// CHECK:STDERR: alias a = C;
// CHECK:STDERR: ^
// CHECK:STDERR:
var a: C = {};
var b: C = {};
// CHECK:STDERR: fail_name_conflict.carbon:[[@LINE+7]]:7: error: duplicate name `b` being declared in the same scope [NameDeclDuplicate]
// CHECK:STDERR: alias b = C;
// CHECK:STDERR: ^
// CHECK:STDERR: fail_name_conflict.carbon:[[@LINE-4]]:5: note: name is previously declared here [NameDeclPrevious]
// CHECK:STDERR: var b: C = {};
// CHECK:STDERR: ^~~~
// CHECK:STDERR:
alias b = C;
// --- fail_not_constant.carbon
library "[[@TEST_NAME]]";
var a: () = ();
var b: ()* = &a;
// CHECK:STDERR: fail_not_constant.carbon:[[@LINE+4]]:11: error: alias refers to a runtime value [AliasRequiresConstantValue]
// CHECK:STDERR: alias c = *b;
// CHECK:STDERR: ^~
// CHECK:STDERR:
alias c = *b;
// --- fail_params.carbon
library "[[@TEST_NAME]]";
// CHECK:STDERR: fail_params.carbon:[[@LINE+4]]:8: error: `alias` declaration cannot have parameters [UnexpectedDeclNameParams]
// CHECK:STDERR: alias A(T:! type) = T*;
// CHECK:STDERR: ^~~~~~~~~~
// CHECK:STDERR:
alias A(T:! type) = T*;
// --- fail_modifiers.carbon
library "[[@TEST_NAME]]";
class Class {}
// CHECK:STDERR: fail_modifiers.carbon:[[@LINE+25]]:10: error: `base` not allowed on declaration with `abstract` [ModifierNotAllowedWith]
// CHECK:STDERR: abstract base default final alias A = Class;
// CHECK:STDERR: ^~~~
// CHECK:STDERR: fail_modifiers.carbon:[[@LINE+22]]:1: note: `abstract` previously appeared here [ModifierPrevious]
// CHECK:STDERR: abstract base default final alias A = Class;
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR:
// CHECK:STDERR: fail_modifiers.carbon:[[@LINE+18]]:15: error: `default` not allowed on declaration with `abstract` [ModifierNotAllowedWith]
// CHECK:STDERR: abstract base default final alias A = Class;
// CHECK:STDERR: ^~~~~~~
// CHECK:STDERR: fail_modifiers.carbon:[[@LINE+15]]:1: note: `abstract` previously appeared here [ModifierPrevious]
// CHECK:STDERR: abstract base default final alias A = Class;
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR:
// CHECK:STDERR: fail_modifiers.carbon:[[@LINE+11]]:23: error: `final` not allowed on declaration with `abstract` [ModifierNotAllowedWith]
// CHECK:STDERR: abstract base default final alias A = Class;
// CHECK:STDERR: ^~~~~
// CHECK:STDERR: fail_modifiers.carbon:[[@LINE+8]]:1: note: `abstract` previously appeared here [ModifierPrevious]
// CHECK:STDERR: abstract base default final alias A = Class;
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR:
// CHECK:STDERR: fail_modifiers.carbon:[[@LINE+4]]:1: error: `abstract` not allowed on `alias` declaration [ModifierNotAllowedOnDeclaration]
// CHECK:STDERR: abstract base default final alias A = Class;
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR:
abstract base default final alias A = Class;
// CHECK:STDERR: fail_modifiers.carbon:[[@LINE+4]]:1: error: `impl` not allowed on `alias` declaration [ModifierNotAllowedOnDeclaration]
// CHECK:STDERR: impl alias B = Class;
// CHECK:STDERR: ^~~~
// CHECK:STDERR:
impl alias B = Class;
// CHECK:STDERR: fail_modifiers.carbon:[[@LINE+4]]:1: error: `extern` not allowed on `alias` declaration [ModifierNotAllowedOnDeclaration]
// CHECK:STDERR: extern alias C = Class;
// CHECK:STDERR: ^~~~~~
// CHECK:STDERR:
extern alias C = Class;
// CHECK:STDOUT: --- alias.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %C: type = class_type @C [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %C.ref: type = name_ref C, %C.decl [concrete = constants.%C]
// CHECK:STDOUT: %c: type = alias_binding c, %C.ref [concrete = constants.%C]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @__global_init() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- alias_of_alias.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %C: type = class_type @C [concrete]
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT: %pattern_type: type = pattern_type %C [concrete]
// CHECK:STDOUT: %empty_struct: %empty_struct_type = struct_value () [concrete]
// CHECK:STDOUT: %C.val: %C = struct_value () [concrete]
// CHECK:STDOUT: %.115: ref %C = temporary invalid, %C.val [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %C.ref: type = name_ref C, %C.decl [concrete = constants.%C]
// CHECK:STDOUT: %a: type = alias_binding a, %C.ref [concrete = constants.%C]
// CHECK:STDOUT: %a.ref: type = name_ref a, %a [concrete = constants.%C]
// CHECK:STDOUT: %b: type = alias_binding b, %a.ref [concrete = constants.%C]
// CHECK:STDOUT: %b.ref: type = name_ref b, %b [concrete = constants.%C]
// CHECK:STDOUT: %c: type = alias_binding c, %b.ref [concrete = constants.%C]
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %d.patt: %pattern_type = value_binding_pattern d [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %c.ref: type = name_ref c, %c [concrete = constants.%C]
// CHECK:STDOUT: %.loc10_13.1: ref %C = temporary_storage
// CHECK:STDOUT: %.loc10_13.2: init %C to %.loc10_13.1 = class_init () [concrete = constants.%C.val]
// CHECK:STDOUT: %.loc10_13.3: init %C = converted @__global_init.%.loc10, %.loc10_13.2 [concrete = constants.%C.val]
// CHECK:STDOUT: %.loc10_13.4: ref %C = temporary %.loc10_13.1, %.loc10_13.3 [concrete = constants.%.115]
// CHECK:STDOUT: %.loc10_13.5: %C = acquire_value %.loc10_13.4 [concrete = constants.%C.val]
// CHECK:STDOUT: %d: %C = value_binding d, %.loc10_13.5
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @__global_init() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %.loc10: %empty_struct_type = struct_literal () [concrete = constants.%empty_struct]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- alias_to_generic.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %A.type: type = generic_class_type @A [concrete]
// CHECK:STDOUT: %A.generic: %A.type = struct_value () [concrete]
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT: %empty_struct: %empty_struct_type = struct_value () [concrete]
// CHECK:STDOUT: %A.940: type = class_type @A, @A(%empty_struct_type) [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %A.ref: %A.type = name_ref A, %A.decl [concrete = constants.%A.generic]
// CHECK:STDOUT: %.loc7_14: %empty_struct_type = struct_literal () [concrete = constants.%empty_struct]
// CHECK:STDOUT: %.loc7_15: type = converted %.loc7_14, constants.%empty_struct_type [concrete = constants.%empty_struct_type]
// CHECK:STDOUT: %A: type = class_type @A, @A(constants.%empty_struct_type) [concrete = constants.%A.940]
// CHECK:STDOUT: %a: type = alias_binding a, %A [concrete = constants.%A.940]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @__global_init() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
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