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Use precise errors during const to pat conversion instead of a catch-all on the main constant

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This commit is contained in:
Oliver Scherer 2020-09-20 17:22:33 +02:00
parent aba5ea1430
commit adf98ab2dc
28 changed files with 240 additions and 115 deletions
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70
compiler/rustc_session/src/lint/builtin.rs
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@ -2138,22 +2138,16 @@ declare_lint! {
/// ```rust,compile_fail
/// #![deny(indirect_structural_match)]
///
/// struct Plus(i32, i32);
/// const ONE_PLUS_TWO: &&Plus = &&Plus(1, 2);
///
/// impl PartialEq for Plus {
/// fn eq(&self, other: &Self) -> bool {
/// self.0 + self.1 == other.0 + other.1
/// }
/// }
///
/// impl Eq for Plus {}
///
/// struct NoDerive(i32);
/// impl PartialEq for NoDerive { fn eq(&self, _: &Self) -> bool { false } }
/// impl Eq for NoDerive { }
/// #[derive(PartialEq, Eq)]
/// struct WrapParam<T>(T);
/// const WRAP_INDIRECT_PARAM: & &WrapParam<NoDerive> = & &WrapParam(NoDerive(0));
/// fn main() {
/// if let ONE_PLUS_TWO = &&Plus(3, 0) {
/// println!("semantic!");
/// } else {
/// println!("structural!");
/// match WRAP_INDIRECT_PARAM {
/// WRAP_INDIRECT_PARAM => { }
/// _ => { }
/// }
/// }
/// ```
@ -2170,9 +2164,8 @@ declare_lint! {
/// [issue #62411]: https://github.com/rust-lang/rust/issues/62411
/// [future-incompatible]: ../index.md#future-incompatible-lints
pub INDIRECT_STRUCTURAL_MATCH,
// defaulting to allow until rust-lang/rust#62614 is fixed.
Allow,
"pattern with const indirectly referencing non-structural-match type",
Warn,
"constant used in pattern contains value of non-structural-match type in a field or a variant",
@future_incompatible = FutureIncompatibleInfo {
reference: "issue #62411 <https://github.com/rust-lang/rust/issues/62411>",
edition: None,
@ -2223,6 +2216,46 @@ declare_lint! {
};
}
declare_lint! {
/// The `nontrivial_structural_match` lint detects constants that are used in patterns,
/// whose type is not structural-match and whose initializer body actually uses values
/// that are not structural-match. So `Option<NotStruturalMatch>` is ok if the constant
/// is just `None`.
///
/// ### Example
///
/// ```rust,compile_fail
/// #![deny(nontrivial_structural_match)]
///
/// struct Plus(i32, i32);
/// const ONE_PLUS_TWO: &&Plus = &&Plus(1, 2);
///
/// impl PartialEq for Plus {
/// fn eq(&self, other: &Self) -> bool {
/// self.0 + self.1 == other.0 + other.1
/// }
/// }
///
/// impl Eq for Plus {}
///
/// fn main() {
/// if let ONE_PLUS_TWO = &&Plus(3, 0) {
/// println!("semantic!");
/// } else {
/// println!("structural!");
/// }
/// }
/// ```
pub NONTRIVIAL_STRUCTURAL_MATCH,
Warn,
"constant used in pattern of non-structural-match type and the constant's initializer \
expression contains values of non-structural-match types",
@future_incompatible = FutureIncompatibleInfo {
reference: "issue #73448 <https://github.com/rust-lang/rust/issues/73448>",
edition: None,
};
}
declare_lint! {
/// The `ambiguous_associated_items` lint detects ambiguity between
/// [associated items] and [enum variants].
@ -2657,6 +2690,7 @@ declare_lint_pass! {
MUTABLE_BORROW_RESERVATION_CONFLICT,
INDIRECT_STRUCTURAL_MATCH,
POINTER_STRUCTURAL_MATCH,
NONTRIVIAL_STRUCTURAL_MATCH,
SOFT_UNSTABLE,
INLINE_NO_SANITIZE,
ASM_SUB_REGISTER,