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Refactor & improve handling of overloaded binary operators

Browse source 
Fixes #9971. Also records them as method resolutions, which we could use
later.
This commit is contained in:
Florian Diebold 2021-08-22 17:21:47 +02:00
parent c8fd4fd410
commit 424dda8113
11 changed files with 317 additions and 261 deletions
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7
crates/hir_def/src/data.rs
View file

@ -199,6 +199,13 @@ impl TraitData {
_ => None,
})
}
pub fn method_by_name(&self, name: &Name) -> Option<FunctionId> {
self.items.iter().find_map(|(item_name, item)| match item {
AssocItemId::FunctionId(t) if item_name == name => Some(*t),
_ => None,
})
}
}
#[derive(Debug, Clone, PartialEq, Eq)]

27
crates/hir_expand/src/name.rs
View file

@ -285,6 +285,33 @@ pub mod known {
wrapping_add,
wrapping_mul,
wrapping_sub,
// known methods of lang items
add,
mul,
sub,
div,
rem,
shl,
shr,
bitxor,
bitor,
bitand,
add_assign,
mul_assign,
sub_assign,
div_assign,
rem_assign,
shl_assign,
shr_assign,
bitxor_assign,
bitor_assign,
bitand_assign,
eq,
ne,
ge,
gt,
le,
lt,
);
// self/Self cannot be used as an identifier

38
crates/hir_ty/src/infer.rs
View file

@ -16,11 +16,11 @@
use std::ops::Index;
use std::sync::Arc;
use chalk_ir::{cast::Cast, DebruijnIndex, Mutability, Safety};
use chalk_ir::{cast::Cast, DebruijnIndex, Mutability, Safety, Scalar};
use hir_def::{
body::Body,
data::{ConstData, FunctionData, StaticData},
expr::{ArithOp, BinaryOp, BindingAnnotation, ExprId, PatId},
expr::{BindingAnnotation, ExprId, PatId},
lang_item::LangItemTarget,
path::{path, Path},
resolver::{HasResolver, ResolveValueResult, Resolver, TypeNs, ValueNs},
@ -134,11 +134,17 @@ pub struct TypeMismatch {
#[derive(Clone, PartialEq, Eq, Debug)]
struct InternedStandardTypes {
unknown: Ty,
bool_: Ty,
unit: Ty,
}
impl Default for InternedStandardTypes {
fn default() -> Self {
InternedStandardTypes { unknown: TyKind::Error.intern(&Interner) }
InternedStandardTypes {
unknown: TyKind::Error.intern(&Interner),
bool_: TyKind::Scalar(Scalar::Bool).intern(&Interner),
unit: TyKind::Tuple(0, Substitution::empty(&Interner)).intern(&Interner),
}
}
}
/// Represents coercing a value to a different type of value.
@ -751,28 +757,6 @@ impl<'a> InferenceContext<'a> {
self.db.trait_data(trait_).associated_type_by_name(&name![Output])
}
fn resolve_binary_op_output(&self, bop: &BinaryOp) -> Option<TypeAliasId> {
let lang_item = match bop {
BinaryOp::ArithOp(aop) => match aop {
ArithOp::Add => "add",
ArithOp::Sub => "sub",
ArithOp::Mul => "mul",
ArithOp::Div => "div",
ArithOp::Shl => "shl",
ArithOp::Shr => "shr",
ArithOp::Rem => "rem",
ArithOp::BitXor => "bitxor",
ArithOp::BitOr => "bitor",
ArithOp::BitAnd => "bitand",
},
_ => return None,
};
let trait_ = self.resolve_lang_item(lang_item)?.as_trait();
self.db.trait_data(trait_?).associated_type_by_name(&name![Output])
}
fn resolve_boxed_box(&self) -> Option<AdtId> {
let struct_ = self.resolve_lang_item("owned_box")?.as_struct()?;
Some(struct_.into())
@ -846,6 +830,10 @@ impl Expectation {
}
}
fn from_option(ty: Option<Ty>) -> Self {
ty.map_or(Expectation::None, Expectation::HasType)
}
/// The following explanation is copied straight from rustc:
/// Provides an expectation for an rvalue expression given an *optional*
/// hint, which is not required for type safety (the resulting type might

241
crates/hir_ty/src/infer/expr.rs
View file

@ -8,10 +8,13 @@ use std::{
use chalk_ir::{cast::Cast, fold::Shift, Mutability, TyVariableKind};
use hir_def::{
expr::{Array, BinaryOp, Expr, ExprId, Literal, MatchGuard, Statement, UnaryOp},
expr::{
ArithOp, Array, BinaryOp, CmpOp, Expr, ExprId, Literal, MatchGuard, Ordering, Statement,
UnaryOp,
},
path::{GenericArg, GenericArgs},
resolver::resolver_for_expr,
AssocContainerId, FieldId, Lookup,
AssocContainerId, FieldId, FunctionId, Lookup,
};
use hir_expand::name::{name, Name};
use stdx::always;
@ -23,7 +26,7 @@ use crate::{
infer::coerce::CoerceMany,
lower::lower_to_chalk_mutability,
mapping::from_chalk,
method_resolution, op,
method_resolution,
primitive::{self, UintTy},
static_lifetime, to_chalk_trait_id,
traits::FnTrait,
@ -669,34 +672,21 @@ impl<'a> InferenceContext<'a> {
}
}
Expr::BinaryOp { lhs, rhs, op } => match op {
Some(op) => {
let lhs_expectation = match op {
BinaryOp::LogicOp(..) => {
Expectation::has_type(TyKind::Scalar(Scalar::Bool).intern(&Interner))
}
_ => Expectation::none(),
};
let lhs_ty = self.infer_expr(*lhs, &lhs_expectation);
let lhs_ty = self.resolve_ty_shallow(&lhs_ty);
let rhs_expectation = op::binary_op_rhs_expectation(*op, lhs_ty.clone());
let rhs_ty =
self.infer_expr_coerce(*rhs, &Expectation::has_type(rhs_expectation));
let rhs_ty = self.resolve_ty_shallow(&rhs_ty);
let ret = op::binary_op_return_ty(*op, lhs_ty.clone(), rhs_ty.clone());
if ret.is_unknown() {
cov_mark::hit!(infer_expr_inner_binary_operator_overload);
self.resolve_associated_type_with_params(
lhs_ty,
self.resolve_binary_op_output(op),
&[rhs_ty],
)
} else {
ret
Some(BinaryOp::Assignment { op: None }) => {
let lhs_ty = self.infer_expr(*lhs, &Expectation::none());
self.infer_expr_coerce(*rhs, &Expectation::has_type(lhs_ty));
self.result.standard_types.unit.clone()
}
Some(BinaryOp::LogicOp(_)) => {
let bool_ty = self.result.standard_types.bool_.clone();
self.infer_expr_coerce(*lhs, &Expectation::HasType(bool_ty.clone()));
let lhs_diverges = self.diverges;
self.infer_expr_coerce(*rhs, &Expectation::HasType(bool_ty.clone()));
// Depending on the LHS' value, the RHS can never execute.
self.diverges = lhs_diverges;
bool_ty
}
Some(op) => self.infer_overloadable_binop(*lhs, *op, *rhs, tgt_expr),
_ => self.err_ty(),
},
Expr::Range { lhs, rhs, range_type } => {
@ -862,6 +852,62 @@ impl<'a> InferenceContext<'a> {
ty
}
fn infer_overloadable_binop(
&mut self,
lhs: ExprId,
op: BinaryOp,
rhs: ExprId,
tgt_expr: ExprId,
) -> Ty {
let lhs_expectation = Expectation::none();
let lhs_ty = self.infer_expr(lhs, &lhs_expectation);
let rhs_ty = self.table.new_type_var();
let func = self.resolve_binop_method(op);
let func = match func {
Some(func) => func,
None => {
let rhs_ty = self.builtin_binary_op_rhs_expectation(op, lhs_ty.clone());
let rhs_ty = self.infer_expr_coerce(rhs, &Expectation::from_option(rhs_ty));
return self
.builtin_binary_op_return_ty(op, lhs_ty, rhs_ty)
.unwrap_or_else(|| self.err_ty());
}
};
let subst = TyBuilder::subst_for_def(self.db, func)
.push(lhs_ty.clone())
.push(rhs_ty.clone())
.build();
self.write_method_resolution(tgt_expr, func, subst.clone());
let method_ty = self.db.value_ty(func.into()).substitute(&Interner, &subst);
self.register_obligations_for_call(&method_ty);
self.infer_expr_coerce(rhs, &Expectation::has_type(rhs_ty.clone()));
let ret_ty = match method_ty.callable_sig(self.db) {
Some(sig) => sig.ret().clone(),
None => self.err_ty(),
};
let ret_ty = self.normalize_associated_types_in(ret_ty);
// FIXME: record autoref adjustments
// use knowledge of built-in binary ops, which can sometimes help inference
if let Some(builtin_rhs) = self.builtin_binary_op_rhs_expectation(op, lhs_ty.clone()) {
self.unify(&builtin_rhs, &rhs_ty);
}
if let Some(builtin_ret) =
self.builtin_binary_op_return_ty(op, lhs_ty.clone(), rhs_ty.clone())
{
self.unify(&builtin_ret, &ret_ty);
}
ret_ty
}
fn infer_block(
&mut self,
expr: ExprId,
@ -1136,4 +1182,141 @@ impl<'a> InferenceContext<'a> {
}
}
}
fn builtin_binary_op_return_ty(&mut self, op: BinaryOp, lhs_ty: Ty, rhs_ty: Ty) -> Option<Ty> {
let lhs_ty = self.resolve_ty_shallow(&lhs_ty);
let rhs_ty = self.resolve_ty_shallow(&rhs_ty);
match op {
BinaryOp::LogicOp(_) | BinaryOp::CmpOp(_) => {
Some(TyKind::Scalar(Scalar::Bool).intern(&Interner))
}
BinaryOp::Assignment { .. } => Some(TyBuilder::unit()),
BinaryOp::ArithOp(ArithOp::Shl | ArithOp::Shr) => {
// all integer combinations are valid here
if matches!(
lhs_ty.kind(&Interner),
TyKind::Scalar(Scalar::Int(_) | Scalar::Uint(_))
| TyKind::InferenceVar(_, TyVariableKind::Integer)
) && matches!(
rhs_ty.kind(&Interner),
TyKind::Scalar(Scalar::Int(_) | Scalar::Uint(_))
| TyKind::InferenceVar(_, TyVariableKind::Integer)
) {
Some(lhs_ty)
} else {
None
}
}
BinaryOp::ArithOp(_) => match (lhs_ty.kind(&Interner), rhs_ty.kind(&Interner)) {
// (int, int) | (uint, uint) | (float, float)
(TyKind::Scalar(Scalar::Int(_)), TyKind::Scalar(Scalar::Int(_)))
| (TyKind::Scalar(Scalar::Uint(_)), TyKind::Scalar(Scalar::Uint(_)))
| (TyKind::Scalar(Scalar::Float(_)), TyKind::Scalar(Scalar::Float(_))) => {
Some(rhs_ty)
}
// ({int}, int) | ({int}, uint)
(
TyKind::InferenceVar(_, TyVariableKind::Integer),
TyKind::Scalar(Scalar::Int(_) | Scalar::Uint(_)),
) => Some(rhs_ty),
// (int, {int}) | (uint, {int})
(
TyKind::Scalar(Scalar::Int(_) | Scalar::Uint(_)),
TyKind::InferenceVar(_, TyVariableKind::Integer),
) => Some(lhs_ty),
// ({float} | float)
(
TyKind::InferenceVar(_, TyVariableKind::Float),
TyKind::Scalar(Scalar::Float(_)),
) => Some(rhs_ty),
// (float, {float})
(
TyKind::Scalar(Scalar::Float(_)),
TyKind::InferenceVar(_, TyVariableKind::Float),
) => Some(lhs_ty),
// ({int}, {int}) | ({float}, {float})
(
TyKind::InferenceVar(_, TyVariableKind::Integer),
TyKind::InferenceVar(_, TyVariableKind::Integer),
)
| (
TyKind::InferenceVar(_, TyVariableKind::Float),
TyKind::InferenceVar(_, TyVariableKind::Float),
) => Some(rhs_ty),
_ => None,
},
}
}
fn builtin_binary_op_rhs_expectation(&mut self, op: BinaryOp, lhs_ty: Ty) -> Option<Ty> {
Some(match op {
BinaryOp::LogicOp(..) => TyKind::Scalar(Scalar::Bool).intern(&Interner),
BinaryOp::Assignment { op: None } => lhs_ty,
BinaryOp::CmpOp(CmpOp::Eq { .. }) => match self
.resolve_ty_shallow(&lhs_ty)
.kind(&Interner)
{
TyKind::Scalar(_) | TyKind::Str => lhs_ty,
TyKind::InferenceVar(_, TyVariableKind::Integer | TyVariableKind::Float) => lhs_ty,
_ => return None,
},
BinaryOp::ArithOp(ArithOp::Shl | ArithOp::Shr) => return None,
BinaryOp::CmpOp(CmpOp::Ord { .. })
| BinaryOp::Assignment { op: Some(_) }
| BinaryOp::ArithOp(_) => match self.resolve_ty_shallow(&lhs_ty).kind(&Interner) {
TyKind::Scalar(Scalar::Int(_) | Scalar::Uint(_) | Scalar::Float(_)) => lhs_ty,
TyKind::InferenceVar(_, TyVariableKind::Integer | TyVariableKind::Float) => lhs_ty,
_ => return None,
},
})
}
fn resolve_binop_method(&self, op: BinaryOp) -> Option<FunctionId> {
let (name, lang_item) = match op {
BinaryOp::LogicOp(_) => return None,
BinaryOp::ArithOp(aop) => match aop {
ArithOp::Add => (name!(add), "add"),
ArithOp::Mul => (name!(mul), "mul"),
ArithOp::Sub => (name!(sub), "sub"),
ArithOp::Div => (name!(div), "div"),
ArithOp::Rem => (name!(rem), "rem"),
ArithOp::Shl => (name!(shl), "shl"),
ArithOp::Shr => (name!(shr), "shr"),
ArithOp::BitXor => (name!(bitxor), "bitxor"),
ArithOp::BitOr => (name!(bitor), "bitor"),
ArithOp::BitAnd => (name!(bitand), "bitand"),
},
BinaryOp::Assignment { op: Some(aop) } => match aop {
ArithOp::Add => (name!(add_assign), "add_assign"),
ArithOp::Mul => (name!(mul_assign), "mul_assign"),
ArithOp::Sub => (name!(sub_assign), "sub_assign"),
ArithOp::Div => (name!(div_assign), "div_assign"),
ArithOp::Rem => (name!(rem_assign), "rem_assign"),
ArithOp::Shl => (name!(shl_assign), "shl_assign"),
ArithOp::Shr => (name!(shr_assign), "shr_assign"),
ArithOp::BitXor => (name!(bitxor_assign), "bitxor_assign"),
ArithOp::BitOr => (name!(bitor_assign), "bitor_assign"),
ArithOp::BitAnd => (name!(bitand_assign), "bitand_assign"),
},
BinaryOp::CmpOp(cop) => match cop {
CmpOp::Eq { negated: false } => (name!(eq), "eq"),
CmpOp::Eq { negated: true } => (name!(ne), "eq"),
CmpOp::Ord { ordering: Ordering::Less, strict: false } => {
(name!(le), "partial_ord")
}
CmpOp::Ord { ordering: Ordering::Less, strict: true } => (name!(lt), "partial_ord"),
CmpOp::Ord { ordering: Ordering::Greater, strict: false } => {
(name!(ge), "partial_ord")
}
CmpOp::Ord { ordering: Ordering::Greater, strict: true } => {
(name!(gt), "partial_ord")
}
},
BinaryOp::Assignment { op: None } => return None,
};
let trait_ = self.resolve_lang_item(lang_item)?.as_trait()?;
self.db.trait_data(trait_).method_by_name(&name)
}
}

1
crates/hir_ty/src/lib.rs
View file

@ -15,7 +15,6 @@ mod infer;
mod interner;
mod lower;
mod mapping;
mod op;
mod tls;
mod utils;
mod walk;

82
crates/hir_ty/src/op.rs
View file

@ -1,82 +0,0 @@
//! Helper functions for binary operator type inference.
use chalk_ir::TyVariableKind;
use hir_def::expr::{ArithOp, BinaryOp, CmpOp};
use crate::{Interner, Scalar, Ty, TyBuilder, TyKind};
pub(super) fn binary_op_return_ty(op: BinaryOp, lhs_ty: Ty, rhs_ty: Ty) -> Ty {
match op {
BinaryOp::LogicOp(_) | BinaryOp::CmpOp(_) => TyKind::Scalar(Scalar::Bool).intern(&Interner),
BinaryOp::Assignment { .. } => TyBuilder::unit(),
BinaryOp::ArithOp(ArithOp::Shl | ArithOp::Shr) => {
// all integer combinations are valid here
if matches!(
lhs_ty.kind(&Interner),
TyKind::Scalar(Scalar::Int(_) | Scalar::Uint(_))
| TyKind::InferenceVar(_, TyVariableKind::Integer)
) && matches!(
rhs_ty.kind(&Interner),
TyKind::Scalar(Scalar::Int(_) | Scalar::Uint(_))
| TyKind::InferenceVar(_, TyVariableKind::Integer)
) {
lhs_ty
} else {
TyKind::Error.intern(&Interner)
}
}
BinaryOp::ArithOp(_) => match (lhs_ty.kind(&Interner), rhs_ty.kind(&Interner)) {
// (int, int) | (uint, uint) | (float, float)
(TyKind::Scalar(Scalar::Int(_)), TyKind::Scalar(Scalar::Int(_)))
| (TyKind::Scalar(Scalar::Uint(_)), TyKind::Scalar(Scalar::Uint(_)))
| (TyKind::Scalar(Scalar::Float(_)), TyKind::Scalar(Scalar::Float(_))) => rhs_ty,
// ({int}, int) | ({int}, uint)
(
TyKind::InferenceVar(_, TyVariableKind::Integer),
TyKind::Scalar(Scalar::Int(_) | Scalar::Uint(_)),
) => rhs_ty,
// (int, {int}) | (uint, {int})
(
TyKind::Scalar(Scalar::Int(_) | Scalar::Uint(_)),
TyKind::InferenceVar(_, TyVariableKind::Integer),
) => lhs_ty,
// ({float} | float)
(TyKind::InferenceVar(_, TyVariableKind::Float), TyKind::Scalar(Scalar::Float(_))) => {
rhs_ty
}
// (float, {float})
(TyKind::Scalar(Scalar::Float(_)), TyKind::InferenceVar(_, TyVariableKind::Float)) => {
lhs_ty
}
// ({int}, {int}) | ({float}, {float})
(
TyKind::InferenceVar(_, TyVariableKind::Integer),
TyKind::InferenceVar(_, TyVariableKind::Integer),
)
| (
TyKind::InferenceVar(_, TyVariableKind::Float),
TyKind::InferenceVar(_, TyVariableKind::Float),
) => rhs_ty,
_ => TyKind::Error.intern(&Interner),
},
}
}
pub(super) fn binary_op_rhs_expectation(op: BinaryOp, lhs_ty: Ty) -> Ty {
match op {
BinaryOp::LogicOp(..) => TyKind::Scalar(Scalar::Bool).intern(&Interner),
BinaryOp::Assignment { op: None } => lhs_ty,
BinaryOp::CmpOp(CmpOp::Eq { .. }) => match lhs_ty.kind(&Interner) {
TyKind::Scalar(_) | TyKind::Str => lhs_ty,
TyKind::InferenceVar(_, TyVariableKind::Integer | TyVariableKind::Float) => lhs_ty,
_ => TyKind::Error.intern(&Interner),
},
BinaryOp::ArithOp(ArithOp::Shl | ArithOp::Shr) => TyKind::Error.intern(&Interner),
BinaryOp::CmpOp(CmpOp::Ord { .. })
| BinaryOp::Assignment { op: Some(_) }
| BinaryOp::ArithOp(_) => match lhs_ty.kind(&Interner) {
TyKind::Scalar(Scalar::Int(_) | Scalar::Uint(_) | Scalar::Float(_)) => lhs_ty,
TyKind::InferenceVar(_, TyVariableKind::Integer | TyVariableKind::Float) => lhs_ty,
_ => TyKind::Error.intern(&Interner),
},
}
}

24
crates/hir_ty/src/tests/coercion.rs
View file

@ -630,3 +630,27 @@ fn test() {
"#,
)
}
#[test]
fn coerce_overloaded_binary_op_rhs() {
check_types(
r#"
//- minicore: deref, add
struct String {}
impl core::ops::Deref for String { type Target = str; }
impl core::ops::Add<&str> for String {
type Output = String;
}
fn test() {
let s1 = String {};
let s2 = String {};
s1 + &s2;
//^^^^^^^^ String
}
"#,
);
}

81
crates/hir_ty/src/tests/simple.rs
View file

@ -2311,89 +2311,24 @@ fn generic_default_depending_on_other_type_arg_forward() {
#[test]
fn infer_operator_overload() {
cov_mark::check!(infer_expr_inner_binary_operator_overload);
check_infer(
check_types(
r#"
struct V2([f32; 2]);
//- minicore: add
struct V2([f32; 2]);
#[lang = "add"]
pub trait Add<Rhs = Self> {
/// The resulting type after applying the `+` operator.
type Output;
/// Performs the `+` operation.
#[must_use]
fn add(self, rhs: Rhs) -> Self::Output;
}
impl Add<V2> for V2 {
impl core::ops::Add<V2> for V2 {
type Output = V2;
}
fn add(self, rhs: V2) -> V2 {
let x = self.0[0] + rhs.0[0];
let y = self.0[1] + rhs.0[1];
V2([x, y])
}
}
fn test() {
fn test() {
let va = V2([0.0, 1.0]);
let vb = V2([0.0, 1.0]);
let r = va + vb;
}
// ^^^^^^^ V2
}
"#,
expect![[r#"
207..211 'self': Self
213..216 'rhs': Rhs
299..303 'self': V2
305..308 'rhs': V2
320..422 '{ ... }': V2
334..335 'x': f32
338..342 'self': V2
338..344 'self.0': [f32; 2]
338..347 'self.0[0]': {unknown}
338..358 'self.0...s.0[0]': f32
345..346 '0': i32
350..353 'rhs': V2
350..355 'rhs.0': [f32; 2]
350..358 'rhs.0[0]': {unknown}
356..357 '0': i32
372..373 'y': f32
376..380 'self': V2
376..382 'self.0': [f32; 2]
376..385 'self.0[1]': {unknown}
376..396 'self.0...s.0[1]': f32
383..384 '1': i32
388..391 'rhs': V2
388..393 'rhs.0': [f32; 2]
388..396 'rhs.0[1]': {unknown}
394..395 '1': i32
406..408 'V2': V2([f32; 2]) -> V2
406..416 'V2([x, y])': V2
409..415 '[x, y]': [f32; 2]
410..411 'x': f32
413..414 'y': f32
436..519 '{ ... vb; }': ()
446..448 'va': V2
451..453 'V2': V2([f32; 2]) -> V2
451..465 'V2([0.0, 1.0])': V2
454..464 '[0.0, 1.0]': [f32; 2]
455..458 '0.0': f32
460..463 '1.0': f32
475..477 'vb': V2
480..482 'V2': V2([f32; 2]) -> V2
480..494 'V2([0.0, 1.0])': V2
483..493 '[0.0, 1.0]': [f32; 2]
484..487 '0.0': f32
489..492 '1.0': f32
505..506 'r': V2
509..511 'va': V2
509..516 'va + vb': V2
514..516 'vb': V2
"#]],
);
}

54
crates/hir_ty/src/tests/traits.rs
View file

@ -1798,66 +1798,32 @@ fn test() {
#[test]
fn closure_2() {
check_infer_with_mismatches(
check_types(
r#"
#[lang = "add"]
pub trait Add<Rhs = Self> {
type Output;
fn add(self, rhs: Rhs) -> Self::Output;
}
//- minicore: add, fn
trait FnOnce<Args> {
type Output;
}
impl Add for u64 {
impl core::ops::Add for u64 {
type Output = Self;
fn add(self, rhs: u64) -> Self::Output {0}
}
impl Add for u128 {
impl core::ops::Add for u128 {
type Output = Self;
fn add(self, rhs: u128) -> Self::Output {0}
}
fn test<F: FnOnce(u32) -> u64>(f: F) {
f(1);
// ^ u32
//^^^^ u64
let g = |v| v + 1;
//^^^^^ u64
//^^^^^^^^^ |u64| -> u64
g(1u64);
//^^^^^^^ u64
let h = |v| 1u128 + v;
//^^^^^^^^^^^^^ |u128| -> u128
}"#,
expect![[r#"
72..76 'self': Self
78..81 'rhs': Rhs
203..207 'self': u64
209..212 'rhs': u64
235..238 '{0}': u64
236..237 '0': u64
297..301 'self': u128
303..306 'rhs': u128
330..333 '{0}': u128
331..332 '0': u128
368..369 'f': F
374..450 '{ ...+ v; }': ()
380..381 'f': F
380..384 'f(1)': {unknown}
382..383 '1': i32
394..395 'g': |u64| -> u64
398..407 '|v| v + 1': |u64| -> u64
399..400 'v': u64
402..403 'v': u64
402..407 'v + 1': u64
406..407 '1': u64
413..414 'g': |u64| -> u64
413..420 'g(1u64)': u64
415..419 '1u64': u64
430..431 'h': |u128| -> u128
434..447 '|v| 1u128 + v': |u128| -> u128
435..436 'v': u128
438..443 '1u128': u128
438..447 '1u128 + v': u128
446..447 'v': u128
"#]],
);
}

4
crates/ide/src/hover.rs
View file

@ -2773,8 +2773,8 @@ fn foo() {
file_id: FileId(
1,
),
full_range: 253..435,
focus_range: 292..298,
full_range: 254..436,
focus_range: 293..299,
name: "Future",
kind: Trait,
description: "pub trait Future",

9
crates/test_utils/src/minicore.rs
View file

@ -34,6 +34,7 @@
//! derive:
//! fmt: result
//! bool_impl: option, fn
//! add:
pub mod marker {
// region:sized
@ -302,6 +303,14 @@ pub mod ops {
}
pub use self::try_::{ControlFlow, FromResidual, Try};
// endregion:try
// region:add
#[lang = "add"]
pub trait Add<Rhs = Self> {
type Output;
fn add(self, rhs: Rhs) -> Self::Output;
}
// endregion:add
}
// region:eq