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This commit is contained in:
Aleksey Kladov 2020-07-14 11:09:41 +02:00
parent 45ec95caf6
commit 7b2ce1a54f
1 changed files with 82 additions and 84 deletions
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166
crates/ra_hir_ty/src/diagnostics/match_check.rs
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@ -272,7 +272,7 @@ impl From<&PatId> for PatIdOrWild {
}
#[derive(Debug, Clone, Copy, PartialEq)]
pub enum MatchCheckErr {
pub(super) enum MatchCheckErr {
NotImplemented,
MalformedMatchArm,
/// Used when type inference cannot resolve the type of
@ -287,21 +287,21 @@ pub enum MatchCheckErr {
///
/// The `std::result::Result` type is used here rather than a custom enum
/// to allow the use of `?`.
pub type MatchCheckResult<T> = Result<T, MatchCheckErr>;
pub(super) type MatchCheckResult<T> = Result<T, MatchCheckErr>;
#[derive(Debug)]
/// A row in a Matrix.
///
/// This type is modeled from the struct of the same name in `rustc`.
pub(crate) struct PatStack(PatStackInner);
pub(super) struct PatStack(PatStackInner);
type PatStackInner = SmallVec<[PatIdOrWild; 2]>;
impl PatStack {
pub(crate) fn from_pattern(pat_id: PatId) -> PatStack {
pub(super) fn from_pattern(pat_id: PatId) -> PatStack {
Self(smallvec!(pat_id.into()))
}
pub(crate) fn from_wild() -> PatStack {
pub(super) fn from_wild() -> PatStack {
Self(smallvec!(PatIdOrWild::Wild))
}
@ -510,14 +510,14 @@ impl PatStack {
/// A collection of PatStack.
///
/// This type is modeled from the struct of the same name in `rustc`.
pub(crate) struct Matrix(Vec<PatStack>);
pub(super) struct Matrix(Vec<PatStack>);
impl Matrix {
pub(crate) fn empty() -> Self {
pub(super) fn empty() -> Self {
Self(vec![])
}
pub(crate) fn push(&mut self, cx: &MatchCheckCtx, row: PatStack) {
pub(super) fn push(&mut self, cx: &MatchCheckCtx, row: PatStack) {
if let Some(Pat::Or(pat_ids)) = row.get_head().map(|pat_id| pat_id.as_pat(cx)) {
// Or patterns are expanded here
for pat_id in pat_ids {
@ -579,16 +579,16 @@ impl Matrix {
/// not matched by an prior match arms.
///
/// We may eventually need an `Unknown` variant here.
pub enum Usefulness {
pub(super) enum Usefulness {
Useful,
NotUseful,
}
pub struct MatchCheckCtx<'a> {
pub match_expr: Idx<Expr>,
pub body: Arc<Body>,
pub infer: Arc<InferenceResult>,
pub db: &'a dyn HirDatabase,
pub(super) struct MatchCheckCtx<'a> {
pub(super) match_expr: Idx<Expr>,
pub(super) body: Arc<Body>,
pub(super) infer: Arc<InferenceResult>,
pub(super) db: &'a dyn HirDatabase,
}
/// Given a set of patterns `matrix`, and pattern to consider `v`, determines
@ -599,7 +599,7 @@ pub struct MatchCheckCtx<'a> {
/// expected that you have already type checked the match arms. All patterns in
/// matrix should be the same type as v, as well as they should all be the same
/// type as the match expression.
pub(crate) fn is_useful(
pub(super) fn is_useful(
cx: &MatchCheckCtx,
matrix: &Matrix,
v: &PatStack,
@ -837,23 +837,23 @@ fn enum_variant_matches(cx: &MatchCheckCtx, pat_id: PatId, enum_variant_id: Enum
#[cfg(test)]
mod tests {
pub(super) use insta::assert_snapshot;
pub(super) use ra_db::fixture::WithFixture;
use insta::assert_snapshot;
use ra_db::fixture::WithFixture;
pub(super) use crate::{diagnostics::MissingMatchArms, test_db::TestDB};
use crate::{diagnostics::MissingMatchArms, test_db::TestDB};
pub(super) fn check_diagnostic_message(ra_fixture: &str) -> String {
fn check_diagnostic_message(ra_fixture: &str) -> String {
TestDB::with_single_file(ra_fixture).0.diagnostic::<MissingMatchArms>().0
}
pub(super) fn check_diagnostic(ra_fixture: &str) {
fn check_diagnostic(ra_fixture: &str) {
let diagnostic_count =
TestDB::with_single_file(ra_fixture).0.diagnostic::<MissingMatchArms>().1;
assert_eq!(1, diagnostic_count, "no diagnostic reported");
}
pub(super) fn check_no_diagnostic(ra_fixture: &str) {
fn check_no_diagnostic(ra_fixture: &str) {
let (s, diagnostic_count) =
TestDB::with_single_file(ra_fixture).0.diagnostic::<MissingMatchArms>();
@ -2036,28 +2036,25 @@ mod tests {
",
);
}
}
#[cfg(test)]
mod false_negatives {
//! The implementation of match checking here is a work in progress. As we roll this out, we
//! prefer false negatives to false positives (ideally there would be no false positives). This
//! test module should document known false negatives. Eventually we will have a complete
//! implementation of match checking and this module will be empty.
//!
//! The reasons for documenting known false negatives:
//!
//! 1. It acts as a backlog of work that can be done to improve the behavior of the system.
//! 2. It ensures the code doesn't panic when handling these cases.
mod false_negatives {
//! The implementation of match checking here is a work in progress. As we roll this out, we
//! prefer false negatives to false positives (ideally there would be no false positives). This
//! test module should document known false negatives. Eventually we will have a complete
//! implementation of match checking and this module will be empty.
//!
//! The reasons for documenting known false negatives:
//!
//! 1. It acts as a backlog of work that can be done to improve the behavior of the system.
//! 2. It ensures the code doesn't panic when handling these cases.
use super::*;
use super::tests::*;
#[test]
fn integers() {
// This is a false negative.
// We don't currently check integer exhaustiveness.
check_no_diagnostic(
r"
#[test]
fn integers() {
// This is a false negative.
// We don't currently check integer exhaustiveness.
check_no_diagnostic(
r"
fn test_fn() {
match 5 {
10 => (),
@ -2065,15 +2062,15 @@ mod false_negatives {
}
}
",
);
}
);
}
#[test]
fn internal_or() {
// This is a false negative.
// We do not currently handle patterns with internal `or`s.
check_no_diagnostic(
r"
#[test]
fn internal_or() {
// This is a false negative.
// We do not currently handle patterns with internal `or`s.
check_no_diagnostic(
r"
fn test_fn() {
enum Either {
A(bool),
@ -2084,17 +2081,17 @@ mod false_negatives {
}
}
",
);
}
);
}
#[test]
fn expr_loop_missing_arm() {
// This is a false negative.
// We currently infer the type of `loop { break Foo::A }` to `!`, which
// causes us to skip the diagnostic since `Either::A` doesn't type check
// with `!`.
check_diagnostic(
r"
#[test]
fn expr_loop_missing_arm() {
// This is a false negative.
// We currently infer the type of `loop { break Foo::A }` to `!`, which
// causes us to skip the diagnostic since `Either::A` doesn't type check
// with `!`.
check_diagnostic(
r"
enum Either {
A,
B,
@ -2105,45 +2102,45 @@ mod false_negatives {
}
}
",
);
}
);
}
#[test]
fn tuple_of_bools_with_ellipsis_at_end_missing_arm() {
// This is a false negative.
// We don't currently handle tuple patterns with ellipsis.
check_no_diagnostic(
r"
#[test]
fn tuple_of_bools_with_ellipsis_at_end_missing_arm() {
// This is a false negative.
// We don't currently handle tuple patterns with ellipsis.
check_no_diagnostic(
r"
fn test_fn() {
match (false, true, false) {
(false, ..) => {},
}
}
",
);
}
);
}
#[test]
fn tuple_of_bools_with_ellipsis_at_beginning_missing_arm() {
// This is a false negative.
// We don't currently handle tuple patterns with ellipsis.
check_no_diagnostic(
r"
#[test]
fn tuple_of_bools_with_ellipsis_at_beginning_missing_arm() {
// This is a false negative.
// We don't currently handle tuple patterns with ellipsis.
check_no_diagnostic(
r"
fn test_fn() {
match (false, true, false) {
(.., false) => {},
}
}
",
);
}
);
}
#[test]
fn struct_missing_arm() {
// This is a false negative.
// We don't currently handle structs.
check_no_diagnostic(
r"
#[test]
fn struct_missing_arm() {
// This is a false negative.
// We don't currently handle structs.
check_no_diagnostic(
r"
struct Foo {
a: bool,
}
@ -2153,6 +2150,7 @@ mod false_negatives {
}
}
",
);
);
}
}
}