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Maintain a list of types permitted per pattern
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12 files changed

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‎compiler/rustc_hir_analysis/messages.ftl

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@@ -438,6 +438,8 @@ hir_analysis_pattern_type_wild_pat = wildcard patterns are not permitted for pat
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.label = this type is the same as the inner type without a pattern
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hir_analysis_placeholder_not_allowed_item_signatures = the placeholder `_` is not allowed within types on item signatures for {$kind}
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.label = not allowed in type signatures
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hir_analysis_invalid_base_type = `{$ty}` is not a valid base type for range patterns
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.note = range patterns only support integers
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hir_analysis_precise_capture_self_alias = `Self` can't be captured in `use<...>` precise captures list, since it is an alias
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.label = `Self` is not a generic argument, but an alias to the type of the {$what}

‎compiler/rustc_hir_analysis/src/errors/pattern_types.rs

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@@ -1,4 +1,5 @@
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use rustc_macros::Diagnostic;
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use rustc_middle::ty::Ty;
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use rustc_span::Span;
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#[derive(Diagnostic)]
@@ -7,3 +8,14 @@ pub(crate) struct WildPatTy {
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#[primary_span]
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pub span: Span,
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}
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#[derive(Diagnostic)]
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#[diag(hir_analysis_invalid_base_type)]
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pub(crate) struct InvalidBaseType<'tcx> {
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pub ty: Ty<'tcx>,
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#[primary_span]
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pub ty_span: Span,
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pub pat: &'static str,
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#[note]
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pub pat_span: Span,
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}

‎compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs

Lines changed: 14 additions & 1 deletion
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@@ -53,7 +53,7 @@ use tracing::{debug, instrument};
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use crate::bounds::Bounds;
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use crate::check::check_abi_fn_ptr;
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use crate::errors::{AmbiguousLifetimeBound, BadReturnTypeNotation, WildPatTy};
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use crate::errors::{AmbiguousLifetimeBound, BadReturnTypeNotation, InvalidBaseType, WildPatTy};
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use crate::hir_ty_lowering::errors::{GenericsArgsErrExtend, prohibit_assoc_item_constraint};
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use crate::hir_ty_lowering::generics::{check_generic_arg_count, lower_generic_args};
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use crate::middle::resolve_bound_vars as rbv;
@@ -2434,13 +2434,26 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
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self.ty_infer(None, hir_ty.span)
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}
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hir::TyKind::Pat(ty, pat) => {
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let ty_span = ty.span;
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let ty = self.lower_ty(ty);
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let pat_ty = match pat.kind {
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hir::PatKind::Wild => {
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let err = self.dcx().emit_err(WildPatTy { span: pat.span });
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Ty::new_error(tcx, err)
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}
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hir::PatKind::Range(start, end, include_end) => {
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let ty = match ty.kind() {
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ty::Int(_) | ty::Uint(_) | ty::Char | ty::Bool => ty,
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_ => Ty::new_error(
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tcx,
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self.dcx().emit_err(InvalidBaseType {
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ty,
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pat: "range",
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ty_span,
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pat_span: pat.span,
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}),
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),
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};
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let expr_to_const = |expr: &'tcx hir::PatExpr<'tcx>| -> ty::Const<'tcx> {
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let (c, c_ty) = match expr.kind {
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hir::PatExprKind::Lit { lit, negated } => {

‎tests/ui/type/pattern_types/bools.rs

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@@ -0,0 +1,18 @@
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//! Check that bools can be used in ranges
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#![feature(pattern_types)]
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#![feature(pattern_type_macro)]
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use std::pat::pattern_type;
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const FALSE: pattern_type!(bool is false..=false) = unsafe { std::mem::transmute(false) };
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const TRUE: pattern_type!(bool is true..=true) = unsafe { std::mem::transmute(true) };
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const ALL_TRUE: pattern_type!(bool is false..=true) = unsafe { std::mem::transmute(true) };
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const ALL_FALSE: pattern_type!(bool is false..=true) = unsafe { std::mem::transmute(false) };
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const BAD_FALSE: pattern_type!(bool is false..=false) = unsafe { std::mem::transmute(true) };
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//~^ ERROR: it is undefined behavior to use this value
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const BAD_TRUE: pattern_type!(bool is true..=true) = unsafe { std::mem::transmute(false) };
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//~^ ERROR: it is undefined behavior to use this value
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fn main() {}

‎tests/ui/type/pattern_types/bools.stderr

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@@ -0,0 +1,25 @@
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error[E0080]: it is undefined behavior to use this value
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--> $DIR/bools.rs:13:1
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|
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LL | const BAD_FALSE: pattern_type!(bool is false..=false) = unsafe { std::mem::transmute(true) };
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value: encountered 1, but expected something equal to 0
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|
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= note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
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= note: the raw bytes of the constant (size: 1, align: 1) {
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01 │ .
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}
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error[E0080]: it is undefined behavior to use this value
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--> $DIR/bools.rs:15:1
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|
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LL | const BAD_TRUE: pattern_type!(bool is true..=true) = unsafe { std::mem::transmute(false) };
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value: encountered 0, but expected something equal to 1
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|
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= note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
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= note: the raw bytes of the constant (size: 1, align: 1) {
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00 │ .
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}
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error: aborting due to 2 previous errors
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For more information about this error, try `rustc --explain E0080`.

‎tests/ui/type/pattern_types/chars.rs

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@@ -0,0 +1,12 @@
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//! Check that chars can be used in ranges
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//@ check-pass
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#![feature(pattern_types)]
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#![feature(pattern_type_macro)]
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use std::pat::pattern_type;
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const LOWERCASE: pattern_type!(char is 'a'..='z') = unsafe { std::mem::transmute('b') };
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fn main() {}

‎tests/ui/type/pattern_types/nested.rs

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@@ -0,0 +1,26 @@
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//! Check that pattern types can only have specific base types
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#![feature(pattern_types)]
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#![feature(pattern_type_macro)]
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use std::pat::pattern_type;
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// Undoing an inner pattern type's restrictions should either be forbidden,
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// or still validate correctly.
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const BAD_NESTING: pattern_type!(pattern_type!(u32 is 1..) is 0..) = todo!();
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//~^ ERROR: not a valid base type for range patterns
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// We want to get the most narrowest version that a pattern could be
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const BAD_NESTING2: pattern_type!(pattern_type!(i32 is 1..) is ..=-1) = todo!();
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//~^ ERROR: not a valid base type for range patterns
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const BAD_NESTING3: pattern_type!(pattern_type!(i32 is 1..) is ..0) = todo!();
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//~^ ERROR: not a valid base type for range patterns
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const BAD_NESTING4: pattern_type!(() is ..0) = todo!();
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//~^ ERROR: not a valid base type for range patterns
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const BAD_NESTING5: pattern_type!(f32 is 1.0 .. 2.0) = todo!();
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//~^ ERROR: not a valid base type for range patterns
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fn main() {}

‎tests/ui/type/pattern_types/nested.stderr

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error: `(u32) is 1..=` is not a valid base type for range patterns
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--> $DIR/nested.rs:10:34
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|
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LL | const BAD_NESTING: pattern_type!(pattern_type!(u32 is 1..) is 0..) = todo!();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^
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|
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note: range patterns only support integers
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--> $DIR/nested.rs:10:63
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|
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LL | const BAD_NESTING: pattern_type!(pattern_type!(u32 is 1..) is 0..) = todo!();
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| ^^^
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error: `(i32) is 1..=` is not a valid base type for range patterns
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--> $DIR/nested.rs:14:35
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|
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LL | const BAD_NESTING2: pattern_type!(pattern_type!(i32 is 1..) is ..=-1) = todo!();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^
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|
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note: range patterns only support integers
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--> $DIR/nested.rs:14:64
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|
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LL | const BAD_NESTING2: pattern_type!(pattern_type!(i32 is 1..) is ..=-1) = todo!();
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| ^^^^^
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error: `(i32) is 1..=` is not a valid base type for range patterns
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--> $DIR/nested.rs:17:35
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|
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LL | const BAD_NESTING3: pattern_type!(pattern_type!(i32 is 1..) is ..0) = todo!();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^
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|
31+
note: range patterns only support integers
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--> $DIR/nested.rs:17:64
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|
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LL | const BAD_NESTING3: pattern_type!(pattern_type!(i32 is 1..) is ..0) = todo!();
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| ^^^
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error: `()` is not a valid base type for range patterns
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--> $DIR/nested.rs:20:35
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|
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LL | const BAD_NESTING4: pattern_type!(() is ..0) = todo!();
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| ^^
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|
43+
note: range patterns only support integers
44+
--> $DIR/nested.rs:20:41
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|
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LL | const BAD_NESTING4: pattern_type!(() is ..0) = todo!();
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| ^^^
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error: `f32` is not a valid base type for range patterns
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--> $DIR/nested.rs:23:35
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|
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LL | const BAD_NESTING5: pattern_type!(f32 is 1.0 .. 2.0) = todo!();
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| ^^^
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|
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note: range patterns only support integers
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--> $DIR/nested.rs:23:42
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|
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LL | const BAD_NESTING5: pattern_type!(f32 is 1.0 .. 2.0) = todo!();
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| ^^^^^^^^^^
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error: aborting due to 5 previous errors
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‎tests/ui/type/pattern_types/pattern_type_mismatch.rs

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@@ -0,0 +1,19 @@
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//! Check that pattern types patterns must be of the type of the base type
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//@ known-bug: unknown
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//@ failure-status: 101
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//@ normalize-stderr: "note: .*\n\n" -> ""
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//@ normalize-stderr: "thread 'rustc' panicked.*\n" -> ""
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//@ normalize-stderr: "(error: internal compiler error: [^:]+):\d+:\d+: " -> "$1:LL:CC: "
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//@ rustc-env:RUST_BACKTRACE=0
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#![feature(pattern_types)]
11+
#![feature(pattern_type_macro)]
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use std::pat::pattern_type;
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const BAD_NESTING4: pattern_type!(bool is 1..=1) = todo!();
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const BAD_NESTING5: pattern_type!(char is 1..=1) = todo!();
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fn main() {}

‎tests/ui/type/pattern_types/pattern_type_mismatch.stderr

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error: internal compiler error: ty::ConstKind::Error constructed but no error reported
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|
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= error: internal compiler error: ty::ConstKind::Error constructed but no error reported
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|
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= note: delayed at compiler/rustc_mir_build/src/thir/constant.rs:72:21 - disabled backtrace
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= error: internal compiler error: mir_const_qualif: MIR had errors
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--> $DIR/pattern_type_mismatch.rs:15:1
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|
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LL | const BAD_NESTING4: pattern_type!(bool is 1..=1) = todo!();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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|
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note: delayed at compiler/rustc_mir_transform/src/lib.rs:358:19 - disabled backtrace
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--> $DIR/pattern_type_mismatch.rs:15:1
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|
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LL | const BAD_NESTING4: pattern_type!(bool is 1..=1) = todo!();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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error: internal compiler error: mir_const_qualif: MIR had errors
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--> $DIR/pattern_type_mismatch.rs:17:1
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|
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LL | const BAD_NESTING5: pattern_type!(char is 1..=1) = todo!();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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|
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note: delayed at compiler/rustc_mir_transform/src/lib.rs:358:19 - disabled backtrace
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--> $DIR/pattern_type_mismatch.rs:17:1
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|
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LL | const BAD_NESTING5: pattern_type!(char is 1..=1) = todo!();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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query stack during panic:
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end of query stack

‎tests/ui/type/pattern_types/reverse_range.rs

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//! Check that the range start must be smaller than the range end
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//@ known-bug: unknown
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//@ failure-status: 101
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//@ normalize-stderr: "note: .*\n\n" -> ""
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//@ normalize-stderr: "thread 'rustc' panicked.*\n" -> ""
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//@ normalize-stderr: "(error: internal compiler error: [^:]+):\d+:\d+: " -> "$1:LL:CC: "
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//@ rustc-env:RUST_BACKTRACE=0
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#![feature(pattern_types)]
10+
#![feature(pattern_type_macro)]
11+
12+
use std::pat::pattern_type;
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14+
const NONE: pattern_type!(bool is true..false) = unsafe { std::mem::transmute(3_u8) };

‎tests/ui/type/pattern_types/reverse_range.stderr

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error[E0601]: `main` function not found in crate `reverse_range`
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--> $DIR/reverse_range.rs:14:87
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|
4+
LL | const NONE: pattern_type!(bool is true..false) = unsafe { std::mem::transmute(3_u8) };
5+
| ^ consider adding a `main` function to `$DIR/reverse_range.rs`
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assertion failed: end <= max_value
9+
error: the compiler unexpectedly panicked. this is a bug.
10+
11+
query stack during panic:
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#0 [eval_to_allocation_raw] const-evaluating + checking `NONE`
13+
#1 [eval_to_const_value_raw] simplifying constant for the type system `NONE`
14+
... and 1 other queries... use `env RUST_BACKTRACE=1` to see the full query stack
15+
error: aborting due to 1 previous error
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For more information about this error, try `rustc --explain E0601`.

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