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carbon-lang/toolchain/check/testdata/while/while.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/bool.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/while/while.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/while/while.carbon
// --- while.carbon
library "[[@TEST_NAME]]";
fn Cond() -> bool;
fn F();
fn G();
fn H();
//@dump-sem-ir-begin
fn While() {
F();
while (Cond()) {
G();
}
H();
}
//@dump-sem-ir-end
// --- unreachable_end.carbon
library "[[@TEST_NAME]]";
fn Cond() -> bool;
fn F();
fn G();
fn H();
//@dump-sem-ir-begin
fn While() {
F();
while (Cond()) {
G();
return;
}
H();
}
//@dump-sem-ir-end
// --- break_continue.carbon
library "[[@TEST_NAME]]";
fn A() -> bool;
fn B() -> bool;
fn C() -> bool;
fn D() -> bool;
fn E() -> bool;
fn F() -> bool;
fn G() -> bool;
fn H() -> bool;
//@dump-sem-ir-begin
fn While() {
while (A()) {
if (B()) { continue; }
if (C()) { break; }
while (D()) {
if (E()) { continue; }
if (F()) { break; }
}
if (G()) { continue; }
if (H()) { break; }
}
}
//@dump-sem-ir-end
// --- fail_bad_condition.carbon
library "[[@TEST_NAME]]";
fn While() {
// CHECK:STDERR: fail_bad_condition.carbon:[[@LINE+7]]:9: error: cannot implicitly convert expression of type `{}` to `bool` [ConversionFailure]
// CHECK:STDERR: while ({}) {}
// CHECK:STDERR: ^~~~
// CHECK:STDERR: fail_bad_condition.carbon:[[@LINE+4]]:9: note: type `{}` does not implement interface `Core.ImplicitAs(bool)` [MissingImplInMemberAccessInContext]
// CHECK:STDERR: while ({}) {}
// CHECK:STDERR: ^~~~
// CHECK:STDERR:
while ({}) {}
}
// --- fail_bad_break_continue.carbon
library "[[@TEST_NAME]]";
fn While() {
// CHECK:STDERR: fail_bad_break_continue.carbon:[[@LINE+4]]:3: error: `continue` can only be used in a loop [ContinueOutsideLoop]
// CHECK:STDERR: continue;
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR:
continue;
// CHECK:STDERR: fail_bad_break_continue.carbon:[[@LINE+4]]:3: error: `break` can only be used in a loop [BreakOutsideLoop]
// CHECK:STDERR: break;
// CHECK:STDERR: ^~~~~
// CHECK:STDERR:
break;
while (false) {
continue;
break;
}
// CHECK:STDERR: fail_bad_break_continue.carbon:[[@LINE+4]]:3: error: `continue` can only be used in a loop [ContinueOutsideLoop]
// CHECK:STDERR: continue;
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR:
continue;
// CHECK:STDERR: fail_bad_break_continue.carbon:[[@LINE+4]]:3: error: `break` can only be used in a loop [BreakOutsideLoop]
// CHECK:STDERR: break;
// CHECK:STDERR: ^~~~~
// CHECK:STDERR:
break;
}
// CHECK:STDOUT: --- while.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Cond.type: type = fn_type @Cond [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %Cond: %Cond.type = struct_value () [concrete]
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: %G.type: type = fn_type @G [concrete]
// CHECK:STDOUT: %G: %G.type = struct_value () [concrete]
// CHECK:STDOUT: %H.type: type = fn_type @H [concrete]
// CHECK:STDOUT: %H: %H.type = struct_value () [concrete]
// CHECK:STDOUT: %While.type: type = fn_type @While [concrete]
// CHECK:STDOUT: %While: %While.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %While.decl: %While.type = fn_decl @While [concrete = constants.%While] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @While() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %F.ref: %F.type = name_ref F, file.%F.decl [concrete = constants.%F]
// CHECK:STDOUT: %F.call: init %empty_tuple.type = call %F.ref()
// CHECK:STDOUT: br !while.cond
// CHECK:STDOUT:
// CHECK:STDOUT: !while.cond:
// CHECK:STDOUT: %Cond.ref: %Cond.type = name_ref Cond, file.%Cond.decl [concrete = constants.%Cond]
// CHECK:STDOUT: %Cond.call: init bool = call %Cond.ref()
// CHECK:STDOUT: %.loc12_16.1: bool = value_of_initializer %Cond.call
// CHECK:STDOUT: %.loc12_16.2: bool = converted %Cond.call, %.loc12_16.1
// CHECK:STDOUT: if %.loc12_16.2 br !while.body else br !while.done
// CHECK:STDOUT:
// CHECK:STDOUT: !while.body:
// CHECK:STDOUT: %G.ref: %G.type = name_ref G, file.%G.decl [concrete = constants.%G]
// CHECK:STDOUT: %G.call: init %empty_tuple.type = call %G.ref()
// CHECK:STDOUT: br !while.cond
// CHECK:STDOUT:
// CHECK:STDOUT: !while.done:
// CHECK:STDOUT: %H.ref: %H.type = name_ref H, file.%H.decl [concrete = constants.%H]
// CHECK:STDOUT: %H.call: init %empty_tuple.type = call %H.ref()
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- unreachable_end.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Cond.type: type = fn_type @Cond [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %Cond: %Cond.type = struct_value () [concrete]
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: %G.type: type = fn_type @G [concrete]
// CHECK:STDOUT: %G: %G.type = struct_value () [concrete]
// CHECK:STDOUT: %H.type: type = fn_type @H [concrete]
// CHECK:STDOUT: %H: %H.type = struct_value () [concrete]
// CHECK:STDOUT: %While.type: type = fn_type @While [concrete]
// CHECK:STDOUT: %While: %While.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %While.decl: %While.type = fn_decl @While [concrete = constants.%While] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @While() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %F.ref: %F.type = name_ref F, file.%F.decl [concrete = constants.%F]
// CHECK:STDOUT: %F.call: init %empty_tuple.type = call %F.ref()
// CHECK:STDOUT: br !while.cond
// CHECK:STDOUT:
// CHECK:STDOUT: !while.cond:
// CHECK:STDOUT: %Cond.ref: %Cond.type = name_ref Cond, file.%Cond.decl [concrete = constants.%Cond]
// CHECK:STDOUT: %Cond.call: init bool = call %Cond.ref()
// CHECK:STDOUT: %.loc12_16.1: bool = value_of_initializer %Cond.call
// CHECK:STDOUT: %.loc12_16.2: bool = converted %Cond.call, %.loc12_16.1
// CHECK:STDOUT: if %.loc12_16.2 br !while.body else br !while.done
// CHECK:STDOUT:
// CHECK:STDOUT: !while.body:
// CHECK:STDOUT: %G.ref: %G.type = name_ref G, file.%G.decl [concrete = constants.%G]
// CHECK:STDOUT: %G.call: init %empty_tuple.type = call %G.ref()
// CHECK:STDOUT: return
// CHECK:STDOUT:
// CHECK:STDOUT: !while.done:
// CHECK:STDOUT: %H.ref: %H.type = name_ref H, file.%H.decl [concrete = constants.%H]
// CHECK:STDOUT: %H.call: init %empty_tuple.type = call %H.ref()
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- break_continue.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %A.type: type = fn_type @A [concrete]
// CHECK:STDOUT: %A: %A.type = struct_value () [concrete]
// CHECK:STDOUT: %B.type: type = fn_type @B [concrete]
// CHECK:STDOUT: %B: %B.type = struct_value () [concrete]
// CHECK:STDOUT: %C.type: type = fn_type @C [concrete]
// CHECK:STDOUT: %C: %C.type = struct_value () [concrete]
// CHECK:STDOUT: %D.type: type = fn_type @D [concrete]
// CHECK:STDOUT: %D: %D.type = struct_value () [concrete]
// CHECK:STDOUT: %E.type: type = fn_type @E [concrete]
// CHECK:STDOUT: %E: %E.type = struct_value () [concrete]
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: %G.type: type = fn_type @G [concrete]
// CHECK:STDOUT: %G: %G.type = struct_value () [concrete]
// CHECK:STDOUT: %H.type: type = fn_type @H [concrete]
// CHECK:STDOUT: %H: %H.type = struct_value () [concrete]
// CHECK:STDOUT: %While.type: type = fn_type @While [concrete]
// CHECK:STDOUT: %While: %While.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %While.decl: %While.type = fn_decl @While [concrete = constants.%While] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @While() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: br !while.cond.loc14
// CHECK:STDOUT:
// CHECK:STDOUT: !while.cond.loc14:
// CHECK:STDOUT: %A.ref: %A.type = name_ref A, file.%A.decl [concrete = constants.%A]
// CHECK:STDOUT: %A.call: init bool = call %A.ref()
// CHECK:STDOUT: %.loc14_13.1: bool = value_of_initializer %A.call
// CHECK:STDOUT: %.loc14_13.2: bool = converted %A.call, %.loc14_13.1
// CHECK:STDOUT: if %.loc14_13.2 br !while.body.loc14 else br !while.done.loc14
// CHECK:STDOUT:
// CHECK:STDOUT: !while.body.loc14:
// CHECK:STDOUT: %B.ref: %B.type = name_ref B, file.%B.decl [concrete = constants.%B]
// CHECK:STDOUT: %B.call: init bool = call %B.ref()
// CHECK:STDOUT: %.loc15_12.1: bool = value_of_initializer %B.call
// CHECK:STDOUT: %.loc15_12.2: bool = converted %B.call, %.loc15_12.1
// CHECK:STDOUT: if %.loc15_12.2 br !if.then.loc15 else br !if.else.loc15
// CHECK:STDOUT:
// CHECK:STDOUT: !if.then.loc15:
// CHECK:STDOUT: br !while.cond.loc14
// CHECK:STDOUT:
// CHECK:STDOUT: !if.else.loc15:
// CHECK:STDOUT: %C.ref: %C.type = name_ref C, file.%C.decl [concrete = constants.%C]
// CHECK:STDOUT: %C.call: init bool = call %C.ref()
// CHECK:STDOUT: %.loc16_12.1: bool = value_of_initializer %C.call
// CHECK:STDOUT: %.loc16_12.2: bool = converted %C.call, %.loc16_12.1
// CHECK:STDOUT: if %.loc16_12.2 br !if.then.loc16 else br !if.else.loc16
// CHECK:STDOUT:
// CHECK:STDOUT: !if.then.loc16:
// CHECK:STDOUT: br !while.done.loc14
// CHECK:STDOUT:
// CHECK:STDOUT: !if.else.loc16:
// CHECK:STDOUT: br !while.cond.loc17
// CHECK:STDOUT:
// CHECK:STDOUT: !while.cond.loc17:
// CHECK:STDOUT: %D.ref: %D.type = name_ref D, file.%D.decl [concrete = constants.%D]
// CHECK:STDOUT: %D.call: init bool = call %D.ref()
// CHECK:STDOUT: %.loc17_15.1: bool = value_of_initializer %D.call
// CHECK:STDOUT: %.loc17_15.2: bool = converted %D.call, %.loc17_15.1
// CHECK:STDOUT: if %.loc17_15.2 br !while.body.loc17 else br !while.done.loc17
// CHECK:STDOUT:
// CHECK:STDOUT: !while.body.loc17:
// CHECK:STDOUT: %E.ref: %E.type = name_ref E, file.%E.decl [concrete = constants.%E]
// CHECK:STDOUT: %E.call: init bool = call %E.ref()
// CHECK:STDOUT: %.loc18_14.1: bool = value_of_initializer %E.call
// CHECK:STDOUT: %.loc18_14.2: bool = converted %E.call, %.loc18_14.1
// CHECK:STDOUT: if %.loc18_14.2 br !if.then.loc18 else br !if.else.loc18
// CHECK:STDOUT:
// CHECK:STDOUT: !if.then.loc18:
// CHECK:STDOUT: br !while.cond.loc17
// CHECK:STDOUT:
// CHECK:STDOUT: !if.else.loc18:
// CHECK:STDOUT: %F.ref: %F.type = name_ref F, file.%F.decl [concrete = constants.%F]
// CHECK:STDOUT: %F.call: init bool = call %F.ref()
// CHECK:STDOUT: %.loc19_14.1: bool = value_of_initializer %F.call
// CHECK:STDOUT: %.loc19_14.2: bool = converted %F.call, %.loc19_14.1
// CHECK:STDOUT: if %.loc19_14.2 br !if.then.loc19 else br !if.else.loc19
// CHECK:STDOUT:
// CHECK:STDOUT: !if.then.loc19:
// CHECK:STDOUT: br !while.done.loc17
// CHECK:STDOUT:
// CHECK:STDOUT: !if.else.loc19:
// CHECK:STDOUT: br !while.cond.loc17
// CHECK:STDOUT:
// CHECK:STDOUT: !while.done.loc17:
// CHECK:STDOUT: %G.ref: %G.type = name_ref G, file.%G.decl [concrete = constants.%G]
// CHECK:STDOUT: %G.call: init bool = call %G.ref()
// CHECK:STDOUT: %.loc21_12.1: bool = value_of_initializer %G.call
// CHECK:STDOUT: %.loc21_12.2: bool = converted %G.call, %.loc21_12.1
// CHECK:STDOUT: if %.loc21_12.2 br !if.then.loc21 else br !if.else.loc21
// CHECK:STDOUT:
// CHECK:STDOUT: !if.then.loc21:
// CHECK:STDOUT: br !while.cond.loc14
// CHECK:STDOUT:
// CHECK:STDOUT: !if.else.loc21:
// CHECK:STDOUT: %H.ref: %H.type = name_ref H, file.%H.decl [concrete = constants.%H]
// CHECK:STDOUT: %H.call: init bool = call %H.ref()
// CHECK:STDOUT: %.loc22_12.1: bool = value_of_initializer %H.call
// CHECK:STDOUT: %.loc22_12.2: bool = converted %H.call, %.loc22_12.1
// CHECK:STDOUT: if %.loc22_12.2 br !if.then.loc22 else br !if.else.loc22
// CHECK:STDOUT:
// CHECK:STDOUT: !if.then.loc22:
// CHECK:STDOUT: br !while.done.loc14
// CHECK:STDOUT:
// CHECK:STDOUT: !if.else.loc22:
// CHECK:STDOUT: br !while.cond.loc14
// CHECK:STDOUT:
// CHECK:STDOUT: !while.done.loc14:
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
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