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Split Level::DelayedBug in two.

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The two kinds of delayed bug have quite different semantics so a
stronger conceptual separation is nice. (`is_error` is a good example,
because the two kinds have different behaviour.)

The commit also moves the `DelayedBug` variant after `Error` in `Level`,
to reflect the fact that it's weaker than `Error` -- it might trigger an
error but also might not. (The pre-existing `downgrade_to_delayed_bug`
function also reflects the notion that delayed bugs are lower/after
normal errors.)

Plus it condenses some of the comments on `Level` into a table, for
easier reading, and introduces `can_be_top_or_sub` to indicate which
levels can be used in top-level diagnostics vs. subdiagnostics.

Finally, it renames `DiagCtxtInner::span_delayed_bugs` as
`DiagCtxtInner::delayed_bugs`. The `span_` prefix is unnecessary because
some delayed bugs don't have a span.
This commit is contained in:
Nicholas Nethercote
2024-01-31 11:23:54 +11:00
parent c367386832
commit 59e0bc2de7
7 changed files with 102 additions and 90 deletions
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18
compiler/rustc_errors/src/diagnostic.rs
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@@ -1,8 +1,7 @@
use crate::snippet::Style;
use crate::{
CodeSuggestion, DelayedBugKind, DiagnosticBuilder, DiagnosticMessage, EmissionGuarantee,
ErrCode, Level, MultiSpan, SubdiagnosticMessage, Substitution, SubstitutionPart,
SuggestionStyle,
CodeSuggestion, DiagnosticBuilder, DiagnosticMessage, EmissionGuarantee, ErrCode, Level,
MultiSpan, SubdiagnosticMessage, Substitution, SubstitutionPart, SuggestionStyle,
};
use rustc_data_structures::fx::{FxHashMap, FxIndexMap};
use rustc_error_messages::fluent_value_from_str_list_sep_by_and;
@@ -235,14 +234,11 @@ impl Diagnostic {
pub fn is_error(&self) -> bool {
match self.level {
Level::Bug
| Level::DelayedBug(DelayedBugKind::Normal)
| Level::Fatal
| Level::Error => true,
Level::Bug | Level::Fatal | Level::Error | Level::DelayedBug => true,
Level::ForceWarning(_)
Level::GoodPathDelayedBug
| Level::ForceWarning(_)
| Level::Warning
| Level::DelayedBug(DelayedBugKind::GoodPath)
| Level::Note
| Level::OnceNote
| Level::Help
@@ -306,11 +302,11 @@ impl Diagnostic {
#[track_caller]
pub fn downgrade_to_delayed_bug(&mut self) {
assert!(
matches!(self.level, Level::Error | Level::DelayedBug(_)),
matches!(self.level, Level::Error | Level::DelayedBug),
"downgrade_to_delayed_bug: cannot downgrade {:?} to DelayedBug: not an error",
self.level
);
self.level = Level::DelayedBug(DelayedBugKind::Normal);
self.level = Level::DelayedBug;
}
/// Appends a labeled span to the diagnostic.