mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-10-06 09:34:42 +01:00
Add support for _ binding patterns (#5097)
Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
This commit is contained in:
Geoff Romer
co-authored by
Jon Ross-Perkins
Jon Ross-Perkins
parent
d8d2da4ea0
commit
a584ee120e
@@ -0,0 +1,288 @@
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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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// This is mostly checking against crashes for compile time bindings in
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// difficult contexts.
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//
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// AUTOUPDATE
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// TIP: To test this file alone, run:
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// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/patterns/no_prelude/underscore.carbon
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// TIP: To dump output, run:
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// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/patterns/no_prelude/underscore.carbon
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// --- basic.carbon
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library "[[@TEST_NAME]]";
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let _: {} = {};
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var _: {} = {};
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fn F() {
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let _: {} = {};
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var _: {} = {};
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}
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// --- function.carbon
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library "[[@TEST_NAME]]";
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fn F(_: {});
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fn G(_: {}) {}
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fn H() {
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F({});
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}
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// --- fail_class.carbon
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library "[[@TEST_NAME]]";
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class C {
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// CHECK:STDERR: fail_class.carbon:[[@LINE+4]]:7: error: semantics TODO: `_ used as field name` [SemanticsTodo]
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// CHECK:STDERR: var _: ();
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// CHECK:STDERR: ^~~~~
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// CHECK:STDERR:
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var _: ();
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}
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// --- fail_interface.carbon
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library "[[@TEST_NAME]]";
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interface I {
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// CHECK:STDERR: fail_interface.carbon:[[@LINE+4]]:7: error: semantics TODO: `_ used as associated constant name` [SemanticsTodo]
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// CHECK:STDERR: let _:! {};
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// CHECK:STDERR: ^~~~~~
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// CHECK:STDERR:
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let _:! {};
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}
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// --- fail_use.carbon
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fn F() -> {} {
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let _: {} = {};
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// CHECK:STDERR: fail_use.carbon:[[@LINE+12]]:10: error: expected expression [ExpectedExpr]
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// CHECK:STDERR: return _;
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// CHECK:STDERR: ^
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// CHECK:STDERR:
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// CHECK:STDERR: fail_use.carbon:[[@LINE+8]]:10: error: `return` statements must end with a `;` [ExpectedStatementSemi]
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// CHECK:STDERR: return _;
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// CHECK:STDERR: ^
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// CHECK:STDERR:
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// CHECK:STDERR: fail_use.carbon:[[@LINE+4]]:10: error: semantics TODO: `handle invalid parse trees in `check`` [SemanticsTodo]
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// CHECK:STDERR: return _;
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// CHECK:STDERR: ^
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// CHECK:STDERR:
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return _;
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}
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// CHECK:STDOUT: --- basic.carbon
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// CHECK:STDOUT:
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// CHECK:STDOUT: constants {
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// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
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// CHECK:STDOUT: %empty_struct: %empty_struct_type = struct_value () [concrete]
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// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
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// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: file {
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// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
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// CHECK:STDOUT: .F = %F.decl
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// CHECK:STDOUT: }
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// CHECK:STDOUT: name_binding_decl {
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// CHECK:STDOUT: %_.patt.loc4: %empty_struct_type = binding_pattern _
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %.loc4_9.1: type = splice_block %.loc4_9.3 [concrete = constants.%empty_struct_type] {
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// CHECK:STDOUT: %.loc4_9.2: %empty_struct_type = struct_literal ()
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// CHECK:STDOUT: %.loc4_9.3: type = converted %.loc4_9.2, constants.%empty_struct_type [concrete = constants.%empty_struct_type]
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %empty_struct: %empty_struct_type = struct_value () [concrete = constants.%empty_struct]
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// CHECK:STDOUT: %.loc4_14: %empty_struct_type = converted @__global_init.%.loc4, %empty_struct [concrete = constants.%empty_struct]
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// CHECK:STDOUT: name_binding_decl {
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// CHECK:STDOUT: %_.patt.loc5: %empty_struct_type = binding_pattern _
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// CHECK:STDOUT: %.loc5_1: %empty_struct_type = var_pattern %_.patt.loc5
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %_.var: ref %empty_struct_type = var _
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// CHECK:STDOUT: %.loc5_9.1: type = splice_block %.loc5_9.3 [concrete = constants.%empty_struct_type] {
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// CHECK:STDOUT: %.loc5_9.2: %empty_struct_type = struct_literal ()
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// CHECK:STDOUT: %.loc5_9.3: type = converted %.loc5_9.2, constants.%empty_struct_type [concrete = constants.%empty_struct_type]
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {} {}
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @F() {
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// CHECK:STDOUT: !entry:
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// CHECK:STDOUT: name_binding_decl {
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// CHECK:STDOUT: %_.patt.loc8: %empty_struct_type = binding_pattern _
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %.loc8_16.1: %empty_struct_type = struct_literal ()
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// CHECK:STDOUT: %.loc8_11.1: type = splice_block %.loc8_11.3 [concrete = constants.%empty_struct_type] {
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// CHECK:STDOUT: %.loc8_11.2: %empty_struct_type = struct_literal ()
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// CHECK:STDOUT: %.loc8_11.3: type = converted %.loc8_11.2, constants.%empty_struct_type [concrete = constants.%empty_struct_type]
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %empty_struct: %empty_struct_type = struct_value () [concrete = constants.%empty_struct]
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// CHECK:STDOUT: %.loc8_16.2: %empty_struct_type = converted %.loc8_16.1, %empty_struct [concrete = constants.%empty_struct]
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// CHECK:STDOUT: name_binding_decl {
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// CHECK:STDOUT: %_.patt.loc9: %empty_struct_type = binding_pattern _
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// CHECK:STDOUT: %.loc9_3.1: %empty_struct_type = var_pattern %_.patt.loc9
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %_.var: ref %empty_struct_type = var _
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// CHECK:STDOUT: %.loc9_16.1: %empty_struct_type = struct_literal ()
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// CHECK:STDOUT: %.loc9_16.2: init %empty_struct_type = struct_init () to %_.var [concrete = constants.%empty_struct]
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// CHECK:STDOUT: %.loc9_3.2: init %empty_struct_type = converted %.loc9_16.1, %.loc9_16.2 [concrete = constants.%empty_struct]
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// CHECK:STDOUT: assign %_.var, %.loc9_3.2
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// CHECK:STDOUT: %.loc9_11.1: type = splice_block %.loc9_11.3 [concrete = constants.%empty_struct_type] {
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// CHECK:STDOUT: %.loc9_11.2: %empty_struct_type = struct_literal ()
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// CHECK:STDOUT: %.loc9_11.3: type = converted %.loc9_11.2, constants.%empty_struct_type [concrete = constants.%empty_struct_type]
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// CHECK:STDOUT: }
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// CHECK:STDOUT: return
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @__global_init() {
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// CHECK:STDOUT: !entry:
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// CHECK:STDOUT: %.loc4: %empty_struct_type = struct_literal ()
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// CHECK:STDOUT: %.loc5_14.1: %empty_struct_type = struct_literal ()
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// CHECK:STDOUT: %.loc5_14.2: init %empty_struct_type = struct_init () to file.%_.var [concrete = constants.%empty_struct]
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// CHECK:STDOUT: %.loc5_1: init %empty_struct_type = converted %.loc5_14.1, %.loc5_14.2 [concrete = constants.%empty_struct]
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// CHECK:STDOUT: assign file.%_.var, %.loc5_1
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// CHECK:STDOUT: return
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: --- function.carbon
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// CHECK:STDOUT:
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// CHECK:STDOUT: constants {
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// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
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// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
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// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
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// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
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// CHECK:STDOUT: %G.type: type = fn_type @G [concrete]
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// CHECK:STDOUT: %G: %G.type = struct_value () [concrete]
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// CHECK:STDOUT: %H.type: type = fn_type @H [concrete]
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// CHECK:STDOUT: %H: %H.type = struct_value () [concrete]
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// CHECK:STDOUT: %empty_struct: %empty_struct_type = struct_value () [concrete]
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: file {
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// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
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// CHECK:STDOUT: .F = %F.decl
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// CHECK:STDOUT: .G = %G.decl
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// CHECK:STDOUT: .H = %H.decl
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {
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// CHECK:STDOUT: %_.patt: %empty_struct_type = binding_pattern _
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// CHECK:STDOUT: %_.param_patt: %empty_struct_type = value_param_pattern %_.patt, call_param0
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// CHECK:STDOUT: } {
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// CHECK:STDOUT: %_.param: %empty_struct_type = value_param call_param0
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// CHECK:STDOUT: %.loc4_10.1: type = splice_block %.loc4_10.3 [concrete = constants.%empty_struct_type] {
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// CHECK:STDOUT: %.loc4_10.2: %empty_struct_type = struct_literal ()
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// CHECK:STDOUT: %.loc4_10.3: type = converted %.loc4_10.2, constants.%empty_struct_type [concrete = constants.%empty_struct_type]
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// CHECK:STDOUT: }
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %G.decl: %G.type = fn_decl @G [concrete = constants.%G] {
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// CHECK:STDOUT: %_.patt: %empty_struct_type = binding_pattern _
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// CHECK:STDOUT: %_.param_patt: %empty_struct_type = value_param_pattern %_.patt, call_param0
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// CHECK:STDOUT: } {
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// CHECK:STDOUT: %_.param: %empty_struct_type = value_param call_param0
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// CHECK:STDOUT: %.loc6_10.1: type = splice_block %.loc6_10.3 [concrete = constants.%empty_struct_type] {
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// CHECK:STDOUT: %.loc6_10.2: %empty_struct_type = struct_literal ()
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// CHECK:STDOUT: %.loc6_10.3: type = converted %.loc6_10.2, constants.%empty_struct_type [concrete = constants.%empty_struct_type]
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// CHECK:STDOUT: }
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %H.decl: %H.type = fn_decl @H [concrete = constants.%H] {} {}
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @F(%_.param_patt: %empty_struct_type);
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @G(%_.param_patt: %empty_struct_type) {
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// CHECK:STDOUT: !entry:
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// CHECK:STDOUT: return
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @H() {
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// CHECK:STDOUT: !entry:
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// CHECK:STDOUT: %F.ref: %F.type = name_ref F, file.%F.decl [concrete = constants.%F]
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// CHECK:STDOUT: %.loc9_6.1: %empty_struct_type = struct_literal ()
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// CHECK:STDOUT: %empty_struct: %empty_struct_type = struct_value () [concrete = constants.%empty_struct]
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// CHECK:STDOUT: %.loc9_6.2: %empty_struct_type = converted %.loc9_6.1, %empty_struct [concrete = constants.%empty_struct]
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// CHECK:STDOUT: %F.call: init %empty_tuple.type = call %F.ref(%.loc9_6.2)
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// CHECK:STDOUT: return
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: --- fail_class.carbon
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// CHECK:STDOUT:
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// CHECK:STDOUT: constants {
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// CHECK:STDOUT: %C: type = class_type @C [concrete]
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// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
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// CHECK:STDOUT: %C.elem: type = unbound_element_type %C, %empty_tuple.type [concrete]
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// CHECK:STDOUT: %struct_type._: type = struct_type {._: %empty_tuple.type} [concrete]
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// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness %struct_type._ [concrete]
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: file {
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// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
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// CHECK:STDOUT: .C = %C.decl
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %C.decl: type = class_decl @C [concrete = constants.%C] {} {}
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: class @C {
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// CHECK:STDOUT: %.loc9_8: %C.elem = field_decl _, element0 [concrete]
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// CHECK:STDOUT: name_binding_decl {
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// CHECK:STDOUT: %.loc9_3: %C.elem = var_pattern %.loc9_8
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %.var: ref %C.elem = var <none>
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// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness %struct_type._ [concrete = constants.%complete_type]
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// CHECK:STDOUT: complete_type_witness = %complete_type
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// CHECK:STDOUT:
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// CHECK:STDOUT: !members:
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// CHECK:STDOUT: .Self = constants.%C
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// CHECK:STDOUT: ._ = %.loc9_8
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: --- fail_interface.carbon
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// CHECK:STDOUT:
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// CHECK:STDOUT: constants {
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// CHECK:STDOUT: %I.type: type = facet_type <@I> [concrete]
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// CHECK:STDOUT: %Self: %I.type = bind_symbolic_name Self, 0 [symbolic]
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// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
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// CHECK:STDOUT: %I.assoc_type: type = assoc_entity_type %I.type [concrete]
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// CHECK:STDOUT: %assoc0: %I.assoc_type = assoc_entity element0, @I.%_ [concrete]
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: file {
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// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
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// CHECK:STDOUT: .I = %I.decl
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %I.decl: type = interface_decl @I [concrete = constants.%I.type] {} {}
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: interface @I {
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// CHECK:STDOUT: %Self: %I.type = bind_symbolic_name Self, 0 [symbolic = constants.%Self]
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// CHECK:STDOUT: %_: %empty_struct_type = assoc_const_decl @_ [concrete] {
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// CHECK:STDOUT: %assoc0: %I.assoc_type = assoc_entity element0, @I.%_ [concrete = constants.%assoc0]
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: !members:
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// CHECK:STDOUT: .Self = %Self
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// CHECK:STDOUT: ._ = @_.%assoc0
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// CHECK:STDOUT: witness = (%_)
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: generic assoc_const @_(@I.%Self: %I.type) {
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// CHECK:STDOUT: assoc_const _:! %empty_struct_type;
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: specific @_(constants.%Self) {}
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// CHECK:STDOUT:
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// CHECK:STDOUT: --- fail_use.carbon
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// CHECK:STDOUT:
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// CHECK:STDOUT: constants {
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// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: file {}
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @F() -> %empty_struct_type;
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// CHECK:STDOUT:
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