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carbon-lang/toolchain/check/testdata/operators/overloaded/string_indexing.carbon
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Richard Smith 05cc09daca Fix cross-package signature mismatches. (#7232) 
Fixes link failures when referencing a symbol involving a fingerprint
from a different package.

Previously we included the `Namespace`'s `import_id` as part of its
fingerprint, which caused local and imported namespaces to get different
fingerprints. We now store the `import_id` on the `NameScope` instead of
on the `Namespace` inst to avoid this problem.

Also, when we reach a package-level `NameScopeId`, consistently
fingerprint it as a (package name, library name) pair. Previously the
fingerprinting depended on whether it was imported or not, as an
imported `NameScopeId` had a parent scope (the current package). We need
to include the library name here so that private entities with the same
name in different libraries have different fingerprints.
2026-05-21 00:02:29 +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/full.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/operators/overloaded/string_indexing.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/operators/overloaded/string_indexing.carbon
// --- fail_literal_negative_index.carbon
library "[[@TEST_NAME]]";
fn TestLiteralNegativeIndex() {
// CHECK:STDERR: fail_literal_negative_index.carbon:[[@LINE+4]]:24: error: index `-1` is negative. [StringAtIndexNegative]
// CHECK:STDERR: let unused c: char = "Test"[-1];
// CHECK:STDERR: ^~~~~~~~~~
// CHECK:STDERR:
let unused c: char = "Test"[-1];
}
// --- fail_literal_out_of_bounds.carbon
library "[[@TEST_NAME]]";
fn TestLiteralOutOfBounds() {
// CHECK:STDERR: fail_literal_out_of_bounds.carbon:[[@LINE+4]]:24: error: string index `4` is out of bounds; string has length 4. [StringAtIndexOutOfBounds]
// CHECK:STDERR: let unused c: char = "Test"[4];
// CHECK:STDERR: ^~~~~~~~~
// CHECK:STDERR:
let unused c: char = "Test"[4];
}
// --- fail_wrong_type.carbon
library "[[@TEST_NAME]]";
fn TestWrongType() {
class C{}
//@dump-sem-ir-begin
// CHECK:STDERR: fail_wrong_type.carbon:[[@LINE+4]]:3: error: cannot access member of interface `Core.IndexWith(type)` in type `str` that does not implement that interface [MissingImplInMemberAccess]
// CHECK:STDERR: "Test"[C];
// CHECK:STDERR: ^~~~~~~~~
// CHECK:STDERR:
"Test"[C];
//@dump-sem-ir-end
}
// --- fail_bad_decl.carbon
library "[[@TEST_NAME]]";
// CHECK:STDERR: fail_bad_decl.carbon:[[@LINE+4]]:1: error: invalid signature for builtin function "string.at" [InvalidBuiltinSignature]
// CHECK:STDERR: fn At(s: str, index: i64) -> i32 = "string.at";
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
fn At(s: str, index: i64) -> i32 = "string.at";
// CHECK:STDERR: fail_bad_decl.carbon:[[@LINE+4]]:1: error: invalid signature for builtin function "string.at" [InvalidBuiltinSignature]
// CHECK:STDERR: fn At2(s: str) -> char = "string.at";
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
fn At2(s: str) -> char = "string.at";
// CHECK:STDERR: fail_bad_decl.carbon:[[@LINE+4]]:1: error: invalid signature for builtin function "string.at" [InvalidBuiltinSignature]
// CHECK:STDERR: fn At3(s: i32, index: i64) -> char = "string.at";
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
fn At3(s: i32, index: i64) -> char = "string.at";
// --- test_string_indexing.carbon
library "[[@TEST_NAME]]";
fn TestStringIndexing() {
//@dump-sem-ir-begin
let unused c: char = "Test"[0];
let unused d: char = "Test"[3];
//@dump-sem-ir-end
}
// CHECK:STDOUT: --- fail_wrong_type.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %C: type = class_type @C [concrete]
// CHECK:STDOUT: %str.91f: type = class_type @String [concrete]
// CHECK:STDOUT: %int_64: Core.IntLiteral = int_value 64 [concrete]
// CHECK:STDOUT: %u64: type = class_type @UInt, @UInt(%int_64) [concrete]
// CHECK:STDOUT: %char: type = class_type @Char [concrete]
// CHECK:STDOUT: %ptr.050: type = ptr_type %char [concrete]
// CHECK:STDOUT: %str.6f5: %ptr.050 = string_literal "Test" [concrete]
// CHECK:STDOUT: %int_4: %u64 = int_value 4 [concrete]
// CHECK:STDOUT: %String.val: %str.91f = struct_value (%str.6f5, %int_4) [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @TestWrongType() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %str: %ptr.050 = string_literal "Test" [concrete = constants.%str.6f5]
// CHECK:STDOUT: %int_4: %u64 = int_value 4 [concrete = constants.%int_4]
// CHECK:STDOUT: %String.val: %str.91f = struct_value (%str, %int_4) [concrete = constants.%String.val]
// CHECK:STDOUT: %C.ref: type = name_ref C, %C.decl [concrete = constants.%C]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- test_string_indexing.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %char: type = class_type @Char [concrete]
// CHECK:STDOUT: %pattern_type.54e: type = pattern_type %char [concrete]
// CHECK:STDOUT: %str.91f: type = class_type @String [concrete]
// CHECK:STDOUT: %int_64: Core.IntLiteral = int_value 64 [concrete]
// CHECK:STDOUT: %u64: type = class_type @UInt, @UInt(%int_64) [concrete]
// CHECK:STDOUT: %ptr.050: type = ptr_type %char [concrete]
// CHECK:STDOUT: %str.6f5: %ptr.050 = string_literal "Test" [concrete]
// CHECK:STDOUT: %int_4: %u64 = int_value 4 [concrete]
// CHECK:STDOUT: %String.val: %str.91f = struct_value (%str.6f5, %int_4) [concrete]
// CHECK:STDOUT: %int_0: Core.IntLiteral = int_value 0 [concrete]
// CHECK:STDOUT: %IndexWith.type.339: type = facet_type <@IndexWith, @IndexWith(Core.IntLiteral)> [concrete]
// CHECK:STDOUT: %i64: type = class_type @Int, @Int(%int_64) [concrete]
// CHECK:STDOUT: %ImplicitAs.type.e82: type = facet_type <@ImplicitAs, @ImplicitAs(%i64)> [concrete]
// CHECK:STDOUT: %T.8a0: %ImplicitAs.type.e82 = symbolic_binding T, 0 [symbolic]
// CHECK:STDOUT: %str.as.IndexWith.impl.At.type.ed3: type = fn_type @str.as.IndexWith.impl.At, @str.as.IndexWith.impl(%T.8a0) [symbolic]
// CHECK:STDOUT: %str.as.IndexWith.impl.At.5fc: %str.as.IndexWith.impl.At.type.ed3 = struct_value () [symbolic]
// CHECK:STDOUT: %ImplicitAs.impl_witness.080: <witness> = impl_witness imports.%ImplicitAs.impl_witness_table.f92, @Core.IntLiteral.as.ImplicitAs.impl(%int_64) [concrete]
// CHECK:STDOUT: %ImplicitAs.facet: %ImplicitAs.type.e82 = facet_value Core.IntLiteral, (%ImplicitAs.impl_witness.080) [concrete]
// CHECK:STDOUT: %IndexWith.impl_witness.df4: <witness> = impl_witness imports.%IndexWith.impl_witness_table, @str.as.IndexWith.impl(%ImplicitAs.facet) [concrete]
// CHECK:STDOUT: %str.as.IndexWith.impl.At.type.495: type = fn_type @str.as.IndexWith.impl.At, @str.as.IndexWith.impl(%ImplicitAs.facet) [concrete]
// CHECK:STDOUT: %str.as.IndexWith.impl.At.b30: %str.as.IndexWith.impl.At.type.495 = struct_value () [concrete]
// CHECK:STDOUT: %IndexWith.facet: %IndexWith.type.339 = facet_value %str.91f, (%IndexWith.impl_witness.df4) [concrete]
// CHECK:STDOUT: %IndexWith.WithSelf.At.type.10f: type = fn_type @IndexWith.WithSelf.At, @IndexWith.WithSelf(Core.IntLiteral, %IndexWith.facet) [concrete]
// CHECK:STDOUT: %.4c4: type = fn_type_with_self_type %IndexWith.WithSelf.At.type.10f, %IndexWith.facet [concrete]
// CHECK:STDOUT: %str.as.IndexWith.impl.At.bound: <bound method> = bound_method %String.val, %str.as.IndexWith.impl.At.b30 [concrete]
// CHECK:STDOUT: %str.as.IndexWith.impl.At.specific_fn: <specific function> = specific_function %str.as.IndexWith.impl.At.b30, @str.as.IndexWith.impl.At(%ImplicitAs.facet) [concrete]
// CHECK:STDOUT: %bound_method: <bound method> = bound_method %String.val, %str.as.IndexWith.impl.At.specific_fn [concrete]
// CHECK:STDOUT: %int_84: %char = int_value 84 [concrete]
// CHECK:STDOUT: %int_3: Core.IntLiteral = int_value 3 [concrete]
// CHECK:STDOUT: %int_116: %char = int_value 116 [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core.import_ref.03f = import_ref Core//prelude/types/string, loc{{\d+_\d+}}, unloaded
// CHECK:STDOUT: %Core.import_ref.897: @str.as.IndexWith.impl.%str.as.IndexWith.impl.At.type (%str.as.IndexWith.impl.At.type.ed3) = import_ref Core//prelude/types/string, loc{{\d+_\d+}}, loaded [symbolic = @str.as.IndexWith.impl.%str.as.IndexWith.impl.At (constants.%str.as.IndexWith.impl.At.5fc)]
// CHECK:STDOUT: %IndexWith.impl_witness_table = impl_witness_table (%Core.import_ref.03f, %Core.import_ref.897), @str.as.IndexWith.impl [concrete]
// CHECK:STDOUT: %Core.import_ref.25a = import_ref Core//prelude/types/int, loc{{\d+_\d+}}, unloaded
// CHECK:STDOUT: %ImplicitAs.impl_witness_table.f92 = impl_witness_table (%Core.import_ref.25a), @Core.IntLiteral.as.ImplicitAs.impl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @TestStringIndexing() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %c.patt: %pattern_type.54e = value_binding_pattern c [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %str.loc5: %ptr.050 = string_literal "Test" [concrete = constants.%str.6f5]
// CHECK:STDOUT: %int_4.loc5: %u64 = int_value 4 [concrete = constants.%int_4]
// CHECK:STDOUT: %String.val.loc5: %str.91f = struct_value (%str.loc5, %int_4.loc5) [concrete = constants.%String.val]
// CHECK:STDOUT: %int_0: Core.IntLiteral = int_value 0 [concrete = constants.%int_0]
// CHECK:STDOUT: %impl.elem1.loc5: %.4c4 = impl_witness_access constants.%IndexWith.impl_witness.df4, element1 [concrete = constants.%str.as.IndexWith.impl.At.b30]
// CHECK:STDOUT: %bound_method.loc5_32.1: <bound method> = bound_method %String.val.loc5, %impl.elem1.loc5 [concrete = constants.%str.as.IndexWith.impl.At.bound]
// CHECK:STDOUT: %ImplicitAs.facet.loc5: %ImplicitAs.type.e82 = facet_value Core.IntLiteral, (constants.%ImplicitAs.impl_witness.080) [concrete = constants.%ImplicitAs.facet]
// CHECK:STDOUT: %.loc5_32.1: %ImplicitAs.type.e82 = converted Core.IntLiteral, %ImplicitAs.facet.loc5 [concrete = constants.%ImplicitAs.facet]
// CHECK:STDOUT: %specific_fn.loc5: <specific function> = specific_function %impl.elem1.loc5, @str.as.IndexWith.impl.At(constants.%ImplicitAs.facet) [concrete = constants.%str.as.IndexWith.impl.At.specific_fn]
// CHECK:STDOUT: %bound_method.loc5_32.2: <bound method> = bound_method %String.val.loc5, %specific_fn.loc5 [concrete = constants.%bound_method]
// CHECK:STDOUT: %str.as.IndexWith.impl.At.call.loc5: init %char = call %bound_method.loc5_32.2(%String.val.loc5, %int_0) [concrete = constants.%int_84]
// CHECK:STDOUT: %char.loc5: type = type_literal constants.%char [concrete = constants.%char]
// CHECK:STDOUT: %.loc5_32.2: %char = value_of_initializer %str.as.IndexWith.impl.At.call.loc5 [concrete = constants.%int_84]
// CHECK:STDOUT: %.loc5_32.3: %char = converted %str.as.IndexWith.impl.At.call.loc5, %.loc5_32.2 [concrete = constants.%int_84]
// CHECK:STDOUT: %c: %char = value_binding c, %.loc5_32.3
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %d.patt: %pattern_type.54e = value_binding_pattern d [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %str.loc6: %ptr.050 = string_literal "Test" [concrete = constants.%str.6f5]
// CHECK:STDOUT: %int_4.loc6: %u64 = int_value 4 [concrete = constants.%int_4]
// CHECK:STDOUT: %String.val.loc6: %str.91f = struct_value (%str.loc6, %int_4.loc6) [concrete = constants.%String.val]
// CHECK:STDOUT: %int_3: Core.IntLiteral = int_value 3 [concrete = constants.%int_3]
// CHECK:STDOUT: %impl.elem1.loc6: %.4c4 = impl_witness_access constants.%IndexWith.impl_witness.df4, element1 [concrete = constants.%str.as.IndexWith.impl.At.b30]
// CHECK:STDOUT: %bound_method.loc6_32.1: <bound method> = bound_method %String.val.loc6, %impl.elem1.loc6 [concrete = constants.%str.as.IndexWith.impl.At.bound]
// CHECK:STDOUT: %ImplicitAs.facet.loc6: %ImplicitAs.type.e82 = facet_value Core.IntLiteral, (constants.%ImplicitAs.impl_witness.080) [concrete = constants.%ImplicitAs.facet]
// CHECK:STDOUT: %.loc6_32.1: %ImplicitAs.type.e82 = converted Core.IntLiteral, %ImplicitAs.facet.loc6 [concrete = constants.%ImplicitAs.facet]
// CHECK:STDOUT: %specific_fn.loc6: <specific function> = specific_function %impl.elem1.loc6, @str.as.IndexWith.impl.At(constants.%ImplicitAs.facet) [concrete = constants.%str.as.IndexWith.impl.At.specific_fn]
// CHECK:STDOUT: %bound_method.loc6_32.2: <bound method> = bound_method %String.val.loc6, %specific_fn.loc6 [concrete = constants.%bound_method]
// CHECK:STDOUT: %str.as.IndexWith.impl.At.call.loc6: init %char = call %bound_method.loc6_32.2(%String.val.loc6, %int_3) [concrete = constants.%int_116]
// CHECK:STDOUT: %char.loc6: type = type_literal constants.%char [concrete = constants.%char]
// CHECK:STDOUT: %.loc6_32.2: %char = value_of_initializer %str.as.IndexWith.impl.At.call.loc6 [concrete = constants.%int_116]
// CHECK:STDOUT: %.loc6_32.3: %char = converted %str.as.IndexWith.impl.At.call.loc6, %.loc6_32.2 [concrete = constants.%int_116]
// CHECK:STDOUT: %d: %char = value_binding d, %.loc6_32.3
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
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