Files
carbon-lang/toolchain/check/testdata/function/declaration/eval_musteval.carbon
T
Chandler Carruth d0badecd2a Switch tests to use the rendered form of diagnostics (#8070)
Historically, we disabled the rendered form in tests outside of
`toolchain/diagnostics`. The idea was to keep tests shorter and avoid
very long chains of autoupdate before stabilizing due to all the line
numbers and other artifacts in the rendered form.

This PR adds `--diagnostic-line-numbers=[all|first]` and defaults to
`first` in tests. This keeps the rendered form so that we can easily
code review that form and the visual cues it does or doesn't provide.
But it removes all but the first location's line numbers to provide
significantly more stability in tests.

By default, tests get the full unicode line-drawing form of diagnostics
so we can ensure all of the artifacts there make sense with the specific
case being diagnosed, but we do retain some focused ASCII-rendering
tests to ensure that fallback remains usable.

There are some issues here that will be fixed in subsequent PRs.
Notably, we try to keep the frame together in the check lines, and so
force some parts to use the first location. This largely works, but
fails in some edge cases, causing the entire frame to be located
incorrectly. There is a TODO about this that we need to fix, and it only
occurs 6 times across the test suite, so it didn't seem worth
front-loading a fix for here.

Assisted-by: Claude Code
2026-11-05 07:19:59 +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/int.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/function/declaration/eval_musteval.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/function/declaration/eval_musteval.carbon
// --- basic.carbon
library "[[@TEST_NAME]]";
fn Basic() -> i32 { return 0; }
eval fn Eval() -> i32 { return 0; }
musteval fn MustEval() -> i32 { return 0; }
// --- member.carbon
library "[[@TEST_NAME]]";
class C {
eval fn Eval() {}
musteval fn MustEval() {}
}
// --- private.carbon
library "[[@TEST_NAME]]";
private eval fn Eval() -> i32 { return 0; }
private musteval fn MustEval() -> i32 { return 0; }
// --- fail_conflict.carbon
library "[[@TEST_NAME]]";
// CHECK:STDERR: ╭─┤ fail_conflict.carbon:[[@LINE+8]]:6
// CHECK:STDERR: -> │ eval musteval fn Mixed();
// CHECK:STDERR: · ──┬─ ━━━━┳━━━
// CHECK:STDERR: · │ ┗━━┫ error: `musteval` not allowed on declaration with `eval`
// CHECK:STDERR: · │ ┃ [ModifierNotAllowedWith]
// CHECK:STDERR: · ╰───────────┤ `eval` previously appeared here [ModifierPrevious]
// CHECK:STDERR: ╰────
// CHECK:STDERR:
eval musteval fn Mixed();
// --- fail_order.carbon
library "[[@TEST_NAME]]";
// CHECK:STDERR: ╭─┤ fail_order.carbon:[[@LINE+8]]:6
// CHECK:STDERR: -> │ eval export fn ExportEval();
// CHECK:STDERR: · ──┬─ ━━━┳━━
// CHECK:STDERR: · │ ┗━━┫ error: `export` must appear before `eval`
// CHECK:STDERR: · │ ┃ [ModifierMustAppearBefore]
// CHECK:STDERR: · ╰──────────┤ `eval` previously appeared here [ModifierPrevious]
// CHECK:STDERR: ╰────
// CHECK:STDERR:
eval export fn ExportEval();
// CHECK:STDERR: ╭─┤ fail_order.carbon:[[@LINE+8]]:6
// CHECK:STDERR: -> │ eval private fn PrivateEval();
// CHECK:STDERR: · ──┬─ ━━━┳━━━
// CHECK:STDERR: · │ ┗━━┫ error: `private` must appear before `eval`
// CHECK:STDERR: · │ ┃ [ModifierMustAppearBefore]
// CHECK:STDERR: · ╰──────────┤ `eval` previously appeared here [ModifierPrevious]
// CHECK:STDERR: ╰────
// CHECK:STDERR:
eval private fn PrivateEval();
class C {
// CHECK:STDERR: ╭─┤ fail_order.carbon:[[@LINE+8]]:8
// CHECK:STDERR: -> │ eval virtual fn VirtualEval();
// CHECK:STDERR: · ──┬─ ━━━┳━━━
// CHECK:STDERR: · │ ┗━━┫ error: `virtual` must appear before `eval`
// CHECK:STDERR: · │ ┃ [ModifierMustAppearBefore]
// CHECK:STDERR: · ╰──────────┤ `eval` previously appeared here [ModifierPrevious]
// CHECK:STDERR: ╰────
// CHECK:STDERR:
eval virtual fn VirtualEval();
}
// --- fail_not_fn.carbon
library "[[@TEST_NAME]]";
// CHECK:STDERR: ╭─┤ fail_not_fn.carbon:[[@LINE+7]]:1
// CHECK:STDERR: -> │ eval var x: i32;
// CHECK:STDERR: · ━━┳━
// CHECK:STDERR: · ┗━━┫ error: `eval` not allowed on `var` declaration
// CHECK:STDERR: · ┃ [ModifierNotAllowedOnDeclaration]
// CHECK:STDERR: ╰────
// CHECK:STDERR:
eval var x: i32;
// CHECK:STDERR: ╭─┤ fail_not_fn.carbon:[[@LINE+7]]:1
// CHECK:STDERR: -> │ eval class C {};
// CHECK:STDERR: · ━━┳━
// CHECK:STDERR: · ┗━━┫ error: `eval` not allowed on `class` declaration
// CHECK:STDERR: · ┃ [ModifierNotAllowedOnDeclaration]
// CHECK:STDERR: ╰────
// CHECK:STDERR:
eval class C {};
// --- redecl.carbon
library "[[@TEST_NAME]]";
eval fn A() -> i32;
eval fn A() -> i32 { return 0; }
musteval fn B() -> i32;
musteval fn B() -> i32 { return 0; }
// --- fail_differ_in_redecl.carbon
library "[[@TEST_NAME]]";
fn NoneThenEval();
fn NoneThenMustEval();
eval fn EvalThenNone();
eval fn EvalThenMustEval();
musteval fn MustEvalThenNone();
musteval fn MustEvalThenEval();
// CHECK:STDERR: ╭─┤ fail_differ_in_redecl.carbon:[[@LINE+12]]:1
// CHECK:STDERR: │ fn NoneThenEval();
// CHECK:STDERR: · ─────────┬────────
// CHECK:STDERR: · ╰──┤ previously not declared as `eval`
// CHECK:STDERR: · │ [FunctionRedeclEvaluationModePrevious]
// CHECK:STDERR: ┆
// CHECK:STDERR: -> │ eval fn NoneThenEval() {}
// CHECK:STDERR: · ━━━━━━━┳━━━━━━━━━━━━━━━━
// CHECK:STDERR: · ┗━━┫ error: function redeclaration differs because new function is `eval`
// CHECK:STDERR: · ┃ [FunctionRedeclEvaluationModeDiffers]
// CHECK:STDERR: ╰────
// CHECK:STDERR:
eval fn NoneThenEval() {}
// CHECK:STDERR: ╭─┤ fail_differ_in_redecl.carbon:[[@LINE+12]]:1
// CHECK:STDERR: │ fn NoneThenMustEval();
// CHECK:STDERR: · ───────────┬──────────
// CHECK:STDERR: · ╰──┤ previously not declared as `musteval`
// CHECK:STDERR: · │ [FunctionRedeclEvaluationModePrevious]
// CHECK:STDERR: ┆
// CHECK:STDERR: -> │ musteval fn NoneThenMustEval() {}
// CHECK:STDERR: · ━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━
// CHECK:STDERR: · ┗━━┫ error: function redeclaration differs because new function is `musteval`
// CHECK:STDERR: · ┃ [FunctionRedeclEvaluationModeDiffers]
// CHECK:STDERR: ╰────
// CHECK:STDERR:
musteval fn NoneThenMustEval() {}
// CHECK:STDERR: ╭─┤ fail_differ_in_redecl.carbon:[[@LINE+12]]:1
// CHECK:STDERR: │ eval fn EvalThenNone();
// CHECK:STDERR: · ───────────┬───────────
// CHECK:STDERR: · ╰──┤ previously declared as `eval`
// CHECK:STDERR: · │ [FunctionRedeclEvaluationModePrevious]
// CHECK:STDERR: ┆
// CHECK:STDERR: -> │ fn EvalThenNone() {}
// CHECK:STDERR: · ━━━┳━━━━━━━━━━━━━━━
// CHECK:STDERR: · ┗━━┫ error: function redeclaration differs because new function is not `eval`
// CHECK:STDERR: · ┃ [FunctionRedeclEvaluationModeDiffers]
// CHECK:STDERR: ╰────
// CHECK:STDERR:
fn EvalThenNone() {}
// CHECK:STDERR: ╭─┤ fail_differ_in_redecl.carbon:[[@LINE+12]]:1
// CHECK:STDERR: │ eval fn EvalThenMustEval();
// CHECK:STDERR: · ─────────────┬─────────────
// CHECK:STDERR: · ╰──┤ previously declared as `eval`
// CHECK:STDERR: · │ [FunctionRedeclEvaluationModePrevious]
// CHECK:STDERR: ┆
// CHECK:STDERR: -> │ musteval fn EvalThenMustEval() {}
// CHECK:STDERR: · ━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━
// CHECK:STDERR: · ┗━━┫ error: function redeclaration differs because new function is `musteval`
// CHECK:STDERR: · ┃ [FunctionRedeclEvaluationModeDiffers]
// CHECK:STDERR: ╰────
// CHECK:STDERR:
musteval fn EvalThenMustEval() {}
// CHECK:STDERR: ╭─┤ fail_differ_in_redecl.carbon:[[@LINE+13]]:1
// CHECK:STDERR: │ musteval fn MustEvalThenNone();
// CHECK:STDERR: · ───────────────┬───────────────
// CHECK:STDERR: · ╰──┤ previously declared as `musteval`
// CHECK:STDERR: · │ [FunctionRedeclEvaluationModePrevious]
// CHECK:STDERR: ┆
// CHECK:STDERR: -> │ fn MustEvalThenNone() {}
// CHECK:STDERR: · ┳━━━━━━━━━━━━━━━━━━━━━━
// CHECK:STDERR: · ┗━━┫ error: function redeclaration differs because new function is not
// CHECK:STDERR: · ┃ `musteval`
// CHECK:STDERR: · ┃ [FunctionRedeclEvaluationModeDiffers]
// CHECK:STDERR: ╰────
// CHECK:STDERR:
fn MustEvalThenNone() {}
// CHECK:STDERR: ╭─┤ fail_differ_in_redecl.carbon:[[@LINE+12]]:1
// CHECK:STDERR: │ musteval fn MustEvalThenEval();
// CHECK:STDERR: · ───────────────┬───────────────
// CHECK:STDERR: · ╰──┤ previously declared as `musteval`
// CHECK:STDERR: · │ [FunctionRedeclEvaluationModePrevious]
// CHECK:STDERR: ┆
// CHECK:STDERR: -> │ eval fn MustEvalThenEval() {}
// CHECK:STDERR: · ━━━━━━━┳━━━━━━━━━━━━━━━━━━━━
// CHECK:STDERR: · ┗━━┫ error: function redeclaration differs because new function is `eval`
// CHECK:STDERR: · ┃ [FunctionRedeclEvaluationModeDiffers]
// CHECK:STDERR: ╰────
// CHECK:STDERR:
eval fn MustEvalThenEval() {}