Rollup merge of rust-lang#104211 - lnicola:rust-analyzer-2022-11-09, …

…r=lnicola

⬆️ rust-analyzer

r? `@ghost`

src/tools/rust-analyzer/.github/ISSUE_TEMPLATE/bug_report.md

@@ -13,8 +13,7 @@ Forum for questions: https://users.rust-lang.org/c/ide/14
 
 Before submitting, please make sure that you're not running into one of these known issues:
 
- 1. extension doesn't load in VSCodium: #11080
- 2. on-the-fly diagnostics are mostly unimplemented (`cargo check` diagnostics will be shown when saving a file): #3107
+ 1. on-the-fly diagnostics are mostly unimplemented (`cargo check` diagnostics will be shown when saving a file): #3107
 
 Otherwise please try to provide information which will help us to fix the issue faster. Minimal reproducible examples with few dependencies are especially lovely <3.
 -->

src/tools/rust-analyzer/.github/ISSUE_TEMPLATE/critical_nightly_regression.md

@@ -2,8 +2,8 @@
 name: Critical Nightly Regression
 about: You are using nightly rust-analyzer and the latest version is unusable.
 title: ''
-labels: ''
-assignees: 'matklad'
+labels: 'Broken Window'
+assignees: ''
 
 ---
 
@@ -14,4 +14,3 @@ Please try to provide information which will help us to fix the issue faster. Mi
 -->
 
 This is a serious regression in nightly and it's important to fix it before the next release.
-@matklad, please take a look.

src/tools/rust-analyzer/.github/workflows/release.yaml

@@ -257,8 +257,7 @@ jobs:
       - name: Publish Extension (OpenVSX, release)
         if: github.ref == 'refs/heads/release' && (github.repository == 'rust-analyzer/rust-analyzer' || github.repository == 'rust-lang/rust-analyzer')
         working-directory: ./editors/code
-        # token from https://dev.azure.com/rust-analyzer/
-        run: npx ovsx publish --pat ${{ secrets.OPENVSX_TOKEN }} --packagePath ../../dist/rust-analyzer-*.vsix || true
+        run: npx ovsx publish --pat ${{ secrets.OPENVSX_TOKEN }} --packagePath ../../dist/rust-analyzer-*.vsix
         timeout-minutes: 2
 
       - name: Publish Extension (Code Marketplace, nightly)
@@ -269,5 +268,5 @@ jobs:
       - name: Publish Extension (OpenVSX, nightly)
         if: github.ref != 'refs/heads/release' && (github.repository == 'rust-analyzer/rust-analyzer' || github.repository == 'rust-lang/rust-analyzer')
         working-directory: ./editors/code
-        run: npx ovsx publish --pat ${{ secrets.OPENVSX_TOKEN }} --packagePath ../../dist/rust-analyzer-*.vsix || true
+        run: npx ovsx publish --pat ${{ secrets.OPENVSX_TOKEN }} --packagePath ../../dist/rust-analyzer-*.vsix
         timeout-minutes: 2

src/tools/rust-analyzer/crates/hir-def/src/pretty.rs

@@ -143,9 +143,12 @@ pub(crate) fn print_type_ref(type_ref: &TypeRef, buf: &mut dyn Write) -> fmt::Re
             print_type_ref(elem, buf)?;
             write!(buf, "]")?;
         }
-        TypeRef::Fn(args_and_ret, varargs) => {
+        TypeRef::Fn(args_and_ret, varargs, is_unsafe) => {
             let ((_, return_type), args) =
                 args_and_ret.split_last().expect("TypeRef::Fn is missing return type");
+            if *is_unsafe {
+                write!(buf, "unsafe ")?;
+            }
             write!(buf, "fn(")?;
             for (i, (_, typeref)) in args.iter().enumerate() {
                 if i != 0 {

src/tools/rust-analyzer/crates/hir-def/src/type_ref.rs

@@ -119,7 +119,7 @@ pub enum TypeRef {
     Array(Box<TypeRef>, ConstScalarOrPath),
     Slice(Box<TypeRef>),
     /// A fn pointer. Last element of the vector is the return type.
-    Fn(Vec<(Option<Name>, TypeRef)>, bool /*varargs*/),
+    Fn(Vec<(Option<Name>, TypeRef)>, bool /*varargs*/, bool /*is_unsafe*/),
     ImplTrait(Vec<Interned<TypeBound>>),
     DynTrait(Vec<Interned<TypeBound>>),
     Macro(AstId<ast::MacroCall>),
@@ -229,7 +229,7 @@ impl TypeRef {
                     Vec::new()
                 };
                 params.push((None, ret_ty));
-                TypeRef::Fn(params, is_varargs)
+                TypeRef::Fn(params, is_varargs, inner.unsafe_token().is_some())
             }
             // for types are close enough for our purposes to the inner type for now...
             ast::Type::ForType(inner) => TypeRef::from_ast_opt(ctx, inner.ty()),
@@ -263,7 +263,7 @@ impl TypeRef {
         fn go(type_ref: &TypeRef, f: &mut impl FnMut(&TypeRef)) {
             f(type_ref);
             match type_ref {
-                TypeRef::Fn(params, _) => {
+                TypeRef::Fn(params, _, _) => {
                     params.iter().for_each(|(_, param_type)| go(param_type, f))
                 }
                 TypeRef::Tuple(types) => types.iter().for_each(|t| go(t, f)),

src/tools/rust-analyzer/crates/hir-ty/src/display.rs

@@ -1187,8 +1187,11 @@ impl HirDisplay for TypeRef {
                 inner.hir_fmt(f)?;
                 write!(f, "]")?;
             }
-            TypeRef::Fn(parameters, is_varargs) => {
+            &TypeRef::Fn(ref parameters, is_varargs, is_unsafe) => {
                 // FIXME: Function pointer qualifiers.
+                if is_unsafe {
+                    write!(f, "unsafe ")?;
+                }
                 write!(f, "fn(")?;
                 if let Some(((_, return_type), function_parameters)) = parameters.split_last() {
                     for index in 0..function_parameters.len() {
@@ -1203,7 +1206,7 @@ impl HirDisplay for TypeRef {
                             write!(f, ", ")?;
                         }
                     }
-                    if *is_varargs {
+                    if is_varargs {
                         write!(f, "{}...", if parameters.len() == 1 { "" } else { ", " })?;
                     }
                     write!(f, ")")?;

src/tools/rust-analyzer/crates/hir-ty/src/infer.rs

@@ -1020,7 +1020,7 @@ impl Expectation {
     /// The primary use case is where the expected type is a fat pointer,
     /// like `&[isize]`. For example, consider the following statement:
     ///
-    ///    let x: &[isize] = &[1, 2, 3];
+    ///     let x: &[isize] = &[1, 2, 3];
     ///
     /// In this case, the expected type for the `&[1, 2, 3]` expression is
     /// `&[isize]`. If however we were to say that `[1, 2, 3]` has the

src/tools/rust-analyzer/crates/hir-ty/src/infer/expr.rs

@@ -85,6 +85,7 @@ impl<'a> InferenceContext<'a> {
         let ty = match &self.body[tgt_expr] {
             Expr::Missing => self.err_ty(),
             &Expr::If { condition, then_branch, else_branch } => {
+                let expected = &expected.adjust_for_branches(&mut self.table);
                 self.infer_expr(
                     condition,
                     &Expectation::has_type(TyKind::Scalar(Scalar::Bool).intern(Interner)),

src/tools/rust-analyzer/crates/hir-ty/src/lib.rs

@@ -38,10 +38,12 @@ use std::sync::Arc;
 use chalk_ir::{
     fold::{Shift, TypeFoldable},
     interner::HasInterner,
-    NoSolution,
+    NoSolution, UniverseIndex,
 };
 use hir_def::{expr::ExprId, type_ref::Rawness, TypeOrConstParamId};
+use hir_expand::name;
 use itertools::Either;
+use traits::FnTrait;
 use utils::Generics;
 
 use crate::{consteval::unknown_const, db::HirDatabase, utils::generics};
@@ -208,6 +210,7 @@ pub(crate) fn make_binders<T: HasInterner<Interner = Interner>>(
 pub struct CallableSig {
     params_and_return: Arc<[Ty]>,
     is_varargs: bool,
+    safety: Safety,
 }
 
 has_interner!(CallableSig);
@@ -216,9 +219,14 @@ has_interner!(CallableSig);
 pub type PolyFnSig = Binders<CallableSig>;
 
 impl CallableSig {
-    pub fn from_params_and_return(mut params: Vec<Ty>, ret: Ty, is_varargs: bool) -> CallableSig {
+    pub fn from_params_and_return(
+        mut params: Vec<Ty>,
+        ret: Ty,
+        is_varargs: bool,
+        safety: Safety,
+    ) -> CallableSig {
         params.push(ret);
-        CallableSig { params_and_return: params.into(), is_varargs }
+        CallableSig { params_and_return: params.into(), is_varargs, safety }
     }
 
     pub fn from_fn_ptr(fn_ptr: &FnPointer) -> CallableSig {
@@ -235,13 +243,14 @@ impl CallableSig {
                 .map(|arg| arg.assert_ty_ref(Interner).clone())
                 .collect(),
             is_varargs: fn_ptr.sig.variadic,
+            safety: fn_ptr.sig.safety,
         }
     }
 
     pub fn to_fn_ptr(&self) -> FnPointer {
         FnPointer {
             num_binders: 0,
-            sig: FnSig { abi: (), safety: Safety::Safe, variadic: self.is_varargs },
+            sig: FnSig { abi: (), safety: self.safety, variadic: self.is_varargs },
             substitution: FnSubst(Substitution::from_iter(
                 Interner,
                 self.params_and_return.iter().cloned(),
@@ -266,7 +275,11 @@ impl TypeFoldable<Interner> for CallableSig {
     ) -> Result<Self, E> {
         let vec = self.params_and_return.to_vec();
         let folded = vec.try_fold_with(folder, outer_binder)?;
-        Ok(CallableSig { params_and_return: folded.into(), is_varargs: self.is_varargs })
+        Ok(CallableSig {
+            params_and_return: folded.into(),
+            is_varargs: self.is_varargs,
+            safety: self.safety,
+        })
     }
 }
 
@@ -508,3 +521,68 @@ where
     });
     Canonical { value, binders: chalk_ir::CanonicalVarKinds::from_iter(Interner, kinds) }
 }
+
+pub fn callable_sig_from_fnonce(
+    self_ty: &Canonical<Ty>,
+    env: Arc<TraitEnvironment>,
+    db: &dyn HirDatabase,
+) -> Option<CallableSig> {
+    let krate = env.krate;
+    let fn_once_trait = FnTrait::FnOnce.get_id(db, krate)?;
+    let output_assoc_type = db.trait_data(fn_once_trait).associated_type_by_name(&name![Output])?;
+
+    let mut kinds = self_ty.binders.interned().to_vec();
+    let b = TyBuilder::trait_ref(db, fn_once_trait);
+    if b.remaining() != 2 {
+        return None;
+    }
+    let fn_once = b
+        .push(self_ty.value.clone())
+        .fill_with_bound_vars(DebruijnIndex::INNERMOST, kinds.len())
+        .build();
+    kinds.extend(fn_once.substitution.iter(Interner).skip(1).map(|x| {
+        let vk = match x.data(Interner) {
+            chalk_ir::GenericArgData::Ty(_) => {
+                chalk_ir::VariableKind::Ty(chalk_ir::TyVariableKind::General)
+            }
+            chalk_ir::GenericArgData::Lifetime(_) => chalk_ir::VariableKind::Lifetime,
+            chalk_ir::GenericArgData::Const(c) => {
+                chalk_ir::VariableKind::Const(c.data(Interner).ty.clone())
+            }
+        };
+        chalk_ir::WithKind::new(vk, UniverseIndex::ROOT)
+    }));
+
+    // FIXME: chalk refuses to solve `<Self as FnOnce<^0.0>>::Output == ^0.1`, so we first solve
+    // `<Self as FnOnce<^0.0>>` and then replace `^0.0` with the concrete argument tuple.
+    let trait_env = env.env.clone();
+    let obligation = InEnvironment { goal: fn_once.cast(Interner), environment: trait_env };
+    let canonical =
+        Canonical { binders: CanonicalVarKinds::from_iter(Interner, kinds), value: obligation };
+    let subst = match db.trait_solve(krate, canonical) {
+        Some(Solution::Unique(vars)) => vars.value.subst,
+        _ => return None,
+    };
+    let args = subst.at(Interner, self_ty.binders.interned().len()).ty(Interner)?;
+    let params = match args.kind(Interner) {
+        chalk_ir::TyKind::Tuple(_, subst) => {
+            subst.iter(Interner).filter_map(|arg| arg.ty(Interner).cloned()).collect::<Vec<_>>()
+        }
+        _ => return None,
+    };
+    if params.iter().any(|ty| ty.is_unknown()) {
+        return None;
+    }
+
+    let fn_once = TyBuilder::trait_ref(db, fn_once_trait)
+        .push(self_ty.value.clone())
+        .push(args.clone())
+        .build();
+    let projection =
+        TyBuilder::assoc_type_projection(db, output_assoc_type, Some(fn_once.substitution.clone()))
+            .build();
+
+    let ret_ty = db.normalize_projection(projection, env);
+
+    Some(CallableSig::from_params_and_return(params, ret_ty.clone(), false, Safety::Safe))
+}

src/tools/rust-analyzer/crates/hir-ty/src/lower.rs

@@ -227,13 +227,17 @@ impl<'a> TyLoweringContext<'a> {
                     .intern(Interner)
             }
             TypeRef::Placeholder => TyKind::Error.intern(Interner),
-            TypeRef::Fn(params, is_varargs) => {
+            &TypeRef::Fn(ref params, variadic, is_unsafe) => {
                 let substs = self.with_shifted_in(DebruijnIndex::ONE, |ctx| {
                     Substitution::from_iter(Interner, params.iter().map(|(_, tr)| ctx.lower_ty(tr)))
                 });
                 TyKind::Function(FnPointer {
                     num_binders: 0, // FIXME lower `for<'a> fn()` correctly
-                    sig: FnSig { abi: (), safety: Safety::Safe, variadic: *is_varargs },
+                    sig: FnSig {
+                        abi: (),
+                        safety: if is_unsafe { Safety::Unsafe } else { Safety::Safe },
+                        variadic,
+                    },
                     substitution: FnSubst(substs),
                 })
                 .intern(Interner)
@@ -1573,7 +1577,12 @@ fn fn_sig_for_fn(db: &dyn HirDatabase, def: FunctionId) -> PolyFnSig {
         .with_type_param_mode(ParamLoweringMode::Variable);
     let ret = ctx_ret.lower_ty(&data.ret_type);
     let generics = generics(db.upcast(), def.into());
-    let sig = CallableSig::from_params_and_return(params, ret, data.is_varargs());
+    let sig = CallableSig::from_params_and_return(
+        params,
+        ret,
+        data.is_varargs(),
+        if data.has_unsafe_kw() { Safety::Unsafe } else { Safety::Safe },
+    );
     make_binders(db, &generics, sig)
 }
 
@@ -1617,7 +1626,7 @@ fn fn_sig_for_struct_constructor(db: &dyn HirDatabase, def: StructId) -> PolyFnS
         TyLoweringContext::new(db, &resolver).with_type_param_mode(ParamLoweringMode::Variable);
     let params = fields.iter().map(|(_, field)| ctx.lower_ty(&field.type_ref)).collect::<Vec<_>>();
     let (ret, binders) = type_for_adt(db, def.into()).into_value_and_skipped_binders();
-    Binders::new(binders, CallableSig::from_params_and_return(params, ret, false))
+    Binders::new(binders, CallableSig::from_params_and_return(params, ret, false, Safety::Safe))
 }
 
 /// Build the type of a tuple struct constructor.
@@ -1644,7 +1653,7 @@ fn fn_sig_for_enum_variant_constructor(db: &dyn HirDatabase, def: EnumVariantId)
         TyLoweringContext::new(db, &resolver).with_type_param_mode(ParamLoweringMode::Variable);
     let params = fields.iter().map(|(_, field)| ctx.lower_ty(&field.type_ref)).collect::<Vec<_>>();
     let (ret, binders) = type_for_adt(db, def.parent.into()).into_value_and_skipped_binders();
-    Binders::new(binders, CallableSig::from_params_and_return(params, ret, false))
+    Binders::new(binders, CallableSig::from_params_and_return(params, ret, false, Safety::Safe))
 }
 
 /// Build the type of a tuple enum variant constructor.

src/tools/rust-analyzer/crates/hir-ty/src/tests/coercion.rs

@@ -122,6 +122,23 @@ fn test() {
     )
 }
 
+#[test]
+fn if_else_adjust_for_branches_discard_type_var() {
+    check_no_mismatches(
+        r#"
+fn test() {
+    let f = || {
+        if true {
+            &""
+        } else {
+            ""
+        }
+    };
+}
+"#,
+    );
+}
+
 #[test]
 fn match_first_coerce() {
     check_no_mismatches(
@@ -182,6 +199,22 @@ fn test() {
     );
 }
 
+#[test]
+fn match_adjust_for_branches_discard_type_var() {
+    check_no_mismatches(
+        r#"
+fn test() {
+    let f = || {
+        match 0i32 {
+            0i32 => &"",
+            _ => "",
+        }
+    };
+}
+"#,
+    );
+}
+
 #[test]
 fn return_coerce_unknown() {
     check_types(
@@ -357,7 +390,7 @@ fn test() {
     let f: fn(u32) -> isize = foo;
                            // ^^^ adjustments: Pointer(ReifyFnPointer)
     let f: unsafe fn(u32) -> isize = foo;
-                                  // ^^^ adjustments: Pointer(ReifyFnPointer)
+                                  // ^^^ adjustments: Pointer(ReifyFnPointer), Pointer(UnsafeFnPointer)
 }",
     );
 }
@@ -388,7 +421,10 @@ fn coerce_closure_to_fn_ptr() {
     check_no_mismatches(
         r"
 fn test() {
-    let f: fn(u32) -> isize = |x| { 1 };
+    let f: fn(u32) -> u32 = |x| x;
+                         // ^^^^^ adjustments: Pointer(ClosureFnPointer(Safe))
+    let f: unsafe fn(u32) -> u32 = |x| x;
+                                // ^^^^^ adjustments: Pointer(ClosureFnPointer(Unsafe))
 }",
     );
 }