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carbon-lang/toolchain/check/testdata/impl/using_invalid_interface.carbon
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Dana Jansens fbc8d59d32 Introduce Diagnostics::ContextScope and remove diagnoser callbacks in type completion (#6761) 
Introduces `Context` and `SoftContext` messages, which can be introduced
through a `ContextBuilder`:
- The `Context` messages come before the diagnostic in the output.
- The first `Context` message steals the diagnostic level from the main
diagnostic, and turns the main diagnostic into a Note attached to the
context.
- A `SoftContext` message works similarly, but if it's preceeded by a
`Context` or `SoftContext` message, then it is dropped. This can be used
as a default/backup scope when nothing more interesting is provided up
the stack, such as in `TryEvalBlockForSpecific`.

The `ContextBuilder` is provided to a callback through
`Diagnostics::ContextScope`, an RAII type `AnnotationScope` but for
context messages.

This allows a high level operation to provide a context message like
"failed to identify facet type {0}" which will then be used as the error
if a diagnostic is produced during identification, with the latter
diagnostic attached as a note to explain why the contextual operation
failed.

In particular, this allows monomorphization errors (such as an array
bound being negative) to be attached to a higher lever operation instead
of being top-level diagnostics themselves, with the monomorphization
site being a note. This inverts the source code locations that appear in
the diagnostic, so that the top-level diagnostic points to the "user
code" which causes the monomorphization.

This is presented as an alternative strategy to #6753, which plumbed
diagnoser callbacks around to achieve the same goals.

We replace the diagnoser callbacks in type completion and operators with
ContextScope callbacks instead, which now provide better diagnostics for
monomorphization errors. Other callers to MakeSpecific do not yet have
ContextScopes introduced in order to turn monomorphization errors into
more interesting diagnostics.
2026-02-25 15:15:29 +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/convert.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/impl/using_invalid_interface.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/impl/using_invalid_interface.carbon
// --- fail_invalid_interface.carbon
library "[[@TEST_NAME]]";
interface I {}
class ArgToI(T:! I) {}
interface IMisuse {
let Arg:! type;
// CHECK:STDERR: fail_invalid_interface.carbon:[[@LINE+7]]:26: error: cannot convert type `Arg` into type implementing `I` [ConversionFailureTypeToFacet]
// CHECK:STDERR: fn Op[self: Self]() -> ArgToI(Arg);
// CHECK:STDERR: ^~~~~~~~~~~
// CHECK:STDERR: fail_invalid_interface.carbon:[[@LINE-7]]:14: note: initializing generic parameter `T` declared here [InitializingGenericParam]
// CHECK:STDERR: class ArgToI(T:! I) {}
// CHECK:STDERR: ^
// CHECK:STDERR:
fn Op[self: Self]() -> ArgToI(Arg);
}
// --- fail_misusing_invalid_interface.carbon
library "[[@TEST_NAME]]";
// This import boundary is significant.
import library "invalid_interface";
class C {
// CHECK:STDERR: fail_misusing_invalid_interface.carbon:[[@LINE+4]]:32: error: name `T` not found [NameNotFound]
// CHECK:STDERR: impl as IMisuse where .Arg = T {
// CHECK:STDERR: ^
// CHECK:STDERR:
impl as IMisuse where .Arg = T {
// CHECK:STDERR: fail_misusing_invalid_interface.carbon:[[@LINE+4]]:42: error: name `T` not found [NameNotFound]
// CHECK:STDERR: fn Op[unused self: Self]() -> ArgToI(T) {
// CHECK:STDERR: ^
// CHECK:STDERR:
fn Op[unused self: Self]() -> ArgToI(T) {
return {};
}
}
}
// CHECK:STDERR: fail_misusing_invalid_interface.carbon:[[@LINE+8]]:21: error: missing object argument in method call [MissingObjectInMethodCall]
// CHECK:STDERR: fn F(T:! IMisuse) { T.Op(); }
// CHECK:STDERR: ^~~~~~
// CHECK:STDERR: fail_misusing_invalid_interface.carbon:[[@LINE-21]]:1: in import [InImport]
// CHECK:STDERR: fail_invalid_interface.carbon:16:3: note: calling function declared here [InCallToFunction]
// CHECK:STDERR: fn Op[self: Self]() -> ArgToI(Arg);
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
fn F(T:! IMisuse) { T.Op(); }
fn G() {
var c: C;
// CHECK:STDERR: fail_misusing_invalid_interface.carbon:[[@LINE+10]]:3: error: cannot implicitly convert non-type value of type `C` into type implementing `IMisuse` [ConversionFailureNonTypeToFacet]
// CHECK:STDERR: F(c);
// CHECK:STDERR: ^~~~
// CHECK:STDERR: fail_misusing_invalid_interface.carbon:[[@LINE+7]]:3: note: type `C` does not implement interface `Core.ImplicitAs(IMisuse)` [MissingImplInMemberAccessInContext]
// CHECK:STDERR: F(c);
// CHECK:STDERR: ^~~~
// CHECK:STDERR: fail_misusing_invalid_interface.carbon:[[@LINE-10]]:6: note: initializing generic parameter `T` declared here [InitializingGenericParam]
// CHECK:STDERR: fn F(T:! IMisuse) { T.Op(); }
// CHECK:STDERR: ^
// CHECK:STDERR:
F(c);
}
// --- fail_using_invalid_interface.carbon
library "[[@TEST_NAME]]";
// This import boundary is significant.
import library "invalid_interface";
class ArgC {}
class C {
impl as IMisuse where .Arg = ArgC {
// CHECK:STDERR: fail_using_invalid_interface.carbon:[[@LINE+8]]:35: error: cannot convert type `ArgC` into type implementing `I` [ConversionFailureTypeToFacet]
// CHECK:STDERR: fn Op[unused self: Self]() -> ArgToI(ArgC) {
// CHECK:STDERR: ^~~~~~~~~~~~
// CHECK:STDERR: fail_using_invalid_interface.carbon:[[@LINE-9]]:1: in import [InImport]
// CHECK:STDERR: fail_invalid_interface.carbon:5:14: note: initializing generic parameter `T` declared here [InitializingGenericParam]
// CHECK:STDERR: class ArgToI(T:! I) {}
// CHECK:STDERR: ^
// CHECK:STDERR:
fn Op[unused self: Self]() -> ArgToI(ArgC) {
return {};
}
}
}
// CHECK:STDERR: fail_using_invalid_interface.carbon:[[@LINE+8]]:21: error: missing object argument in method call [MissingObjectInMethodCall]
// CHECK:STDERR: fn F(T:! IMisuse) { T.Op(); }
// CHECK:STDERR: ^~~~~~
// CHECK:STDERR: fail_using_invalid_interface.carbon:[[@LINE-23]]:1: in import [InImport]
// CHECK:STDERR: fail_invalid_interface.carbon:16:3: note: calling function declared here [InCallToFunction]
// CHECK:STDERR: fn Op[self: Self]() -> ArgToI(Arg);
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
fn F(T:! IMisuse) { T.Op(); }
fn G() {
var c: C;
// CHECK:STDERR: fail_using_invalid_interface.carbon:[[@LINE+10]]:3: error: cannot implicitly convert non-type value of type `C` into type implementing `IMisuse` [ConversionFailureNonTypeToFacet]
// CHECK:STDERR: F(c);
// CHECK:STDERR: ^~~~
// CHECK:STDERR: fail_using_invalid_interface.carbon:[[@LINE+7]]:3: note: type `C` does not implement interface `Core.ImplicitAs(IMisuse)` [MissingImplInMemberAccessInContext]
// CHECK:STDERR: F(c);
// CHECK:STDERR: ^~~~
// CHECK:STDERR: fail_using_invalid_interface.carbon:[[@LINE-10]]:6: note: initializing generic parameter `T` declared here [InitializingGenericParam]
// CHECK:STDERR: fn F(T:! IMisuse) { T.Op(); }
// CHECK:STDERR: ^
// CHECK:STDERR:
F(c);
}
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