[Rust] Updated derived traits mapping (#3944)

src/Fable.Cli/CHANGELOG.md

@@ -20,6 +20,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
+* [Rust] Updated derived traits mapping (by @ncave)
 * [Rust] Fixed try finally handler order of execution (by @ncave)
 * [JS/TS/Python/Rust] Fixed String.StartsWith/EndsWith (#3934) (by @ncave)
 * [All/Rust] Removed Regex.Replace from hot paths (by @ncave)

src/Fable.Transforms/Rust/Fable2Rust.fs

@@ -402,75 +402,58 @@ module TypeInfo =
             ent.IsValueType
         | _ -> false
 
-    let isEntityOfType (com: IRustCompiler) isTypeOf entNames (ent: Fable.Entity) =
+    let hasTypeOfType (com: IRustCompiler) isTypeOf isEntityOf entNames typ =
+        match typ with
+        | Fable.Option(genArg, _) -> isTypeOf com entNames genArg
+        | Fable.Array(genArg, _) -> isTypeOf com entNames genArg
+        | Fable.List genArg -> isTypeOf com entNames genArg
+        | Fable.Tuple(genArgs, _) -> List.exists (isTypeOf com entNames) genArgs
+        | Fable.AnonymousRecordType(_, genArgs, _) -> List.exists (isTypeOf com entNames) genArgs
+        | Replacements.Util.Builtin(Replacements.Util.FSharpSet genArg) -> isTypeOf com entNames genArg
+        | Replacements.Util.Builtin(Replacements.Util.FSharpMap(k, v)) ->
+            isTypeOf com entNames k || isTypeOf com entNames v
+        | Fable.DeclaredType(entRef, _genArgs) ->
+            let ent = com.GetEntity(entRef)
+            isEntityOf com entNames ent //|| hasFieldOfType com isTypeOf entNames ent
+        | _ -> false
+
+    let hasFieldOfType (com: IRustCompiler) isTypeOf entNames (ent: Fable.Entity) =
         if Set.contains ent.FullName entNames then
-            true // already checked, avoids circular checks
+            false // already checked, avoids circular checks
         else
             let entNames = Set.add ent.FullName entNames
 
             if ent.IsFSharpUnion then
                 ent.UnionCases
-                |> Seq.forall (fun uci ->
+                |> Seq.exists (fun uci ->
                     uci.UnionCaseFields
-                    |> List.forall (fun field -> isTypeOf com entNames field.FieldType)
+                    |> List.exists (fun fi -> isTypeOf com entNames fi.FieldType)
                 )
             else
-                ent.FSharpFields |> Seq.forall (fun fi -> isTypeOf com entNames fi.FieldType)
+                ent.FSharpFields |> Seq.exists (fun fi -> isTypeOf com entNames fi.FieldType)
 
-    let isTypeOfType (com: IRustCompiler) isTypeOf isEntityOf entNames typ =
+    let isNonPrintableType (com: IRustCompiler) entNames typ =
         match typ with
-        | Fable.Option(genArg, _) -> isTypeOf com entNames genArg
-        | Fable.Array(genArg, _) -> isTypeOf com entNames genArg
-        | Fable.List genArg -> isTypeOf com entNames genArg
-        | Fable.Tuple(genArgs, _) -> List.forall (isTypeOf com entNames) genArgs
-        | Fable.AnonymousRecordType(_, genArgs, _isStruct) -> List.forall (isTypeOf com entNames) genArgs
-        | Replacements.Util.Builtin(Replacements.Util.FSharpSet genArg) -> isTypeOf com entNames genArg
-        | Replacements.Util.Builtin(Replacements.Util.FSharpMap(k, v)) ->
-            isTypeOf com entNames k && isTypeOf com entNames v
-        | Fable.DeclaredType(entRef, _) ->
-            let ent = com.GetEntity(entRef)
-            isEntityOf com entNames ent
-        | _ -> true
+        // TODO: more unprintable types?
+        | _ -> hasTypeOfType com isNonPrintableType isNonPrintableEntity entNames typ
 
-    let isPrintableType (com: IRustCompiler) entNames typ =
-        match typ with
-        // TODO: Any unprintable types?
-        | _ -> isTypeOfType com isPrintableType isPrintableEntity entNames typ
-
-    let isPrintableEntity com entNames (ent: Fable.Entity) =
-        not (ent.IsInterface) && (isEntityOfType com isPrintableType entNames ent)
+    let isNonPrintableEntity com entNames (ent: Fable.Entity) = false
+    // || (hasFieldOfType com isNonPrintableType entNames ent)
 
-    let isDefaultableType (com: IRustCompiler) entNames typ =
+    let isNonDefaultableType (com: IRustCompiler) entNames typ =
         match typ with
         // TODO: more undefaultable types?
         | Fable.LambdaType _
-        | Fable.DelegateType _ -> false
-        | _ -> isTypeOfType com isDefaultableType isDefaultableEntity entNames typ
-
-    let isDefaultableEntity com entNames (ent: Fable.Entity) =
-        ent.IsValueType
-        && not (ent.IsInterface)
-        && not (ent.IsFSharpUnion) // deriving 'Default' on enums is experimental
-        && (isEntityOfType com isDefaultableType entNames ent)
-
-    let isHashableType (com: IRustCompiler) entNames typ =
-        match typ with
-        // TODO: more unhashable types?
-        | Fable.Any
-        | Fable.Unit
-        | Fable.Measure _
-        | Fable.MetaType
-        | Fable.Number((Float32 | Float64), _)
-        | Fable.LambdaType _
-        | Fable.DelegateType _ -> false
-        | _ -> isTypeOfType com isHashableType isHashableEntity entNames typ
+        | Fable.DelegateType _ -> true
+        | _ -> hasTypeOfType com isNonDefaultableType isNonDefaultableEntity entNames typ
 
-    let isHashableEntity com entNames (ent: Fable.Entity) =
-        not (ent.IsInterface)
-        && (FSharp2Fable.Util.hasStructuralEquality ent)
-        && (isEntityOfType com isHashableType entNames ent)
+    let isNonDefaultableEntity com entNames (ent: Fable.Entity) =
+        ent.IsInterface
+        || not ent.IsValueType
+        || ent.IsFSharpUnion // deriving 'Default' on enums is experimental
+        || (hasFieldOfType com isNonDefaultableType entNames ent)
 
-    let isCopyableType (com: IRustCompiler) entNames typ =
+    let isNonCopyableType (com: IRustCompiler) entNames typ =
         match typ with
         // TODO: more uncopyable types?
         | Fable.Any
@@ -481,37 +464,34 @@ module TypeInfo =
         | Fable.DelegateType _
         | Fable.GenericParam _
         | Fable.String
-        | Fable.Regex -> false
-        | Fable.Tuple(genArgs, isStruct) -> isStruct && (List.forall (isCopyableType com entNames) genArgs)
-        | Fable.AnonymousRecordType(_, genArgs, isStruct) ->
-            isStruct && (List.forall (isCopyableType com entNames) genArgs)
-        | _ -> isTypeOfType com isCopyableType isCopyableEntity entNames typ
-
-    let isCopyableEntity com entNames (ent: Fable.Entity) =
-        ent.IsValueType
-        && not (ent.IsInterface)
-        && not (hasMutableFields com ent)
-        && (isEntityOfType com isCopyableType entNames ent)
-
-    let isEquatableType (com: IRustCompiler) entNames typ =
+        | Fable.Regex -> true
+        | Fable.Tuple(genArgs, isStruct) when not isStruct -> true
+        | Fable.AnonymousRecordType(_, genArgs, isStruct) when not isStruct -> true
+        | _ -> hasTypeOfType com isNonCopyableType isNonCopyableEntity entNames typ
+
+    let isNonCopyableEntity com entNames (ent: Fable.Entity) =
+        not ent.IsValueType
+        || (hasMutableFields com ent)
+        || (hasFieldOfType com isNonCopyableType entNames ent)
+
+    let isNonEquatableType (com: IRustCompiler) entNames typ =
         match typ with
         // TODO: more unequatable types?
         | Fable.Any
         | Fable.Unit
         | Fable.Measure _
         | Fable.MetaType
         | Fable.LambdaType _
-        | Fable.DelegateType _ -> false
+        | Fable.DelegateType _ -> true
         // | Fable.GenericParam(_, _, constraints) ->
-        //     constraints |> List.contains Fable.Constraint.HasEquality
-        | _ -> isTypeOfType com isEquatableType isEquatableEntity entNames typ
+        //     not (constraints |> List.contains Fable.Constraint.HasEquality)
+        | _ -> hasTypeOfType com isNonEquatableType isNonEquatableEntity entNames typ
 
-    let isEquatableEntity com entNames (ent: Fable.Entity) =
-        not (ent.IsInterface)
-        && (FSharp2Fable.Util.hasStructuralEquality ent)
-        && (isEntityOfType com isEquatableType entNames ent)
+    let isNonEquatableEntity com entNames (ent: Fable.Entity) =
+        ent.IsInterface || not (FSharp2Fable.Util.hasStructuralEquality ent)
+    // || (hasFieldOfType com isNonEquatableType entNames ent)
 
-    let isComparableType (com: IRustCompiler) entNames typ =
+    let isNonComparableType (com: IRustCompiler) entNames typ =
         match typ with
         // TODO: more uncomparable types?
         | Fable.Any
@@ -520,15 +500,32 @@ module TypeInfo =
         | Fable.MetaType
         | Fable.LambdaType _
         | Fable.DelegateType _
-        | Fable.Regex -> false
+        | Fable.Regex -> true
         // | Fable.GenericParam(_, _, constraints) ->
-        //     constraints |> List.contains Fable.Constraint.HasComparison
-        | _ -> isTypeOfType com isComparableType isComparableEntity entNames typ
+        //     not (constraints |> List.contains Fable.Constraint.HasComparison)
+        | _ -> hasTypeOfType com isNonComparableType isNonComparableEntity entNames typ
 
-    let isComparableEntity com entNames (ent: Fable.Entity) =
-        not (ent.IsInterface)
-        && (FSharp2Fable.Util.hasStructuralComparison ent)
-        && (isEntityOfType com isComparableType entNames ent)
+    let isNonComparableEntity com entNames (ent: Fable.Entity) =
+        ent.IsInterface
+        || not (FSharp2Fable.Util.hasStructuralComparison ent)
+        || (hasFieldOfType com isNonComparableType entNames ent)
+
+    let isNonHashableType com entNames typ =
+        match typ with
+        // TODO: more unhashable types?
+        | Fable.Any
+        | Fable.Unit
+        | Fable.Measure _
+        | Fable.MetaType
+        | Fable.Number((Float32 | Float64), _)
+        | Fable.LambdaType _
+        | Fable.DelegateType _ -> true
+        | _ -> hasTypeOfType com isNonHashableType isNonHashableEntity entNames typ
+
+    let isNonHashableEntity com entNames (ent: Fable.Entity) =
+        ent.IsInterface
+        || not (FSharp2Fable.Util.hasStructuralEquality ent)
+        || (hasFieldOfType com isNonHashableType entNames ent)
 
     let isWrappedType com typ =
         match typ with
@@ -1301,11 +1298,6 @@ module Util =
         else
             ty
 
-    let memberFromName (memberName: string) : Rust.Expr * bool =
-        match memberName with
-        | "ToString" -> (mkGenericPathExpr [ "ToString" ] None), false
-        | n -> (mkGenericPathExpr [ n ] None), false
-
     let getField r (expr: Rust.Expr) (fieldName: string) =
         mkFieldExpr expr (fieldName |> sanitizeMember) // ?loc=r)
 
@@ -3890,10 +3882,7 @@ module Util =
             | Fable.Constraint.HasDefaultConstructor -> []
             | Fable.Constraint.HasComparison -> [ makeRawBound "PartialOrd" ]
             | Fable.Constraint.HasEquality ->
-                [
-                    makeGenBound ("core" :: "hash" :: "Hash" :: []) []
-                    makeRawBound "PartialEq" // "Eq"
-                ]
+                [ makeGenBound ("core" :: "hash" :: "Hash" :: []) []; makeRawBound "PartialEq" ]
             | Fable.Constraint.IsUnmanaged -> []
             | Fable.Constraint.IsEnum -> []
 
@@ -4259,32 +4248,28 @@ module Util =
         fnItem
 
     let makeDerivedFrom com (ent: Fable.Entity) =
-        let isCopyable = ent |> isCopyableEntity com Set.empty
-        let isPrintable = ent |> isPrintableEntity com Set.empty
-        let isDefaultable = ent |> isDefaultableEntity com Set.empty
-        let isComparable = ent |> isComparableEntity com Set.empty
-        let isEquatable = ent |> isEquatableEntity com Set.empty
-        let isHashable = ent |> isHashableEntity com Set.empty
+        // let isCopyable = not (ent |> isNonCopyableEntity com Set.empty)
+        let isPrintable = not (ent |> isNonPrintableEntity com Set.empty)
+        let isDefaultable = not (ent |> isNonDefaultableEntity com Set.empty)
+        let isHashable = not (ent |> isNonHashableEntity com Set.empty)
+        let isEquatable = not (ent |> isNonEquatableEntity com Set.empty)
+        let isComparable = not (ent |> isNonComparableEntity com Set.empty)
 
         let derivedFrom =
             [
                 rawIdent "Clone"
-                if isCopyable then
-                    rawIdent "Copy"
+                // if isCopyable then
+                //     rawIdent "Copy"
                 if isPrintable then
                     rawIdent "Debug"
                 if isDefaultable then
                     rawIdent "Default"
+                if isHashable then
+                    rawIdent "Hash"
                 if isEquatable then
                     rawIdent "PartialEq"
                 if isComparable then
                     rawIdent "PartialOrd"
-                if isHashable then
-                    rawIdent "Hash"
-                if isEquatable && isHashable then
-                    rawIdent "Eq"
-            // if isComparable && isHashable then
-            //     rawIdent "Ord"
             ]
 
         derivedFrom

src/Fable.Transforms/Rust/Replacements.fs

@@ -433,7 +433,8 @@ let isCompatibleWithNativeComparison =
     | GenericParam _
     | Array _
     | List _
-    | Builtin(BclGuid | BclTimeSpan) -> true
+    | Builtin(BclGuid) -> true
+    | Builtin(BclTimeSpan) -> true
     | _ -> false
 
 // Overview of hash rules:
@@ -474,7 +475,8 @@ let equals (com: ICompiler) ctx r (left: Expr) (right: Expr) =
     | Boolean
     | Char
     | String
-    | Number _ -> makeEqOp r left right BinaryEqual
+    | Number _
+    | Builtin(FSharpChoice _ | FSharpResult _) -> makeEqOp r left right BinaryEqual
     | Builtin kind -> Helper.LibCall(com, coreModFor kind, "equals", t, [ left; right ], ?loc = r)
     | Array _ -> Helper.LibCall(com, "Array", "equals", t, [ left; right ], ?loc = r)
     | List _ -> Helper.LibCall(com, "List", "equals", t, [ left; right ], ?loc = r)
@@ -499,7 +501,8 @@ let compare (com: ICompiler) ctx r (left: Expr) (right: Expr) =
     | Boolean
     | Char
     | String
-    | Number _ -> Helper.LibCall(com, "Native", "compare", t, [ left; right ], ?loc = r)
+    | Number _
+    | Builtin(FSharpChoice _ | FSharpResult _) -> Helper.LibCall(com, "Native", "compare", t, [ left; right ], ?loc = r)
     | Builtin kind -> Helper.LibCall(com, coreModFor kind, "compareTo", t, [ left; right ], ?loc = r)
     | Array _ -> Helper.LibCall(com, "Array", "compareTo", t, [ left; right ], ?loc = r)
     | List _ -> Helper.LibCall(com, "List", "compareTo", t, [ left; right ], ?loc = r)

src/fable-library-rust/src/Async.rs

@@ -161,7 +161,7 @@ pub mod Monitor_ {
     use std::thread;
     use std::time::Duration;
 
-    use crate::Native_::{Func0, Lrc};
+    use crate::Native_::{Func0, LrcPtr};
 
     static mut LOCKS: Option<RwLock<HashSet<usize>>> = None;
     fn try_init_and_get_locks() -> &'static RwLock<HashSet<usize>> {
@@ -175,7 +175,7 @@ pub mod Monitor_ {
         }
     }
 
-    pub fn enter<T>(o: Lrc<T>) {
+    pub fn enter<T>(o: LrcPtr<T>) {
         let p = Arc::<T>::as_ptr(&o) as usize;
         loop {
             let otherHasLock = try_init_and_get_locks().read().unwrap().get(&p).is_some();
@@ -188,7 +188,7 @@ pub mod Monitor_ {
         }
     }
 
-    pub fn exit<T>(o: Lrc<T>) {
+    pub fn exit<T>(o: LrcPtr<T>) {
         let p = Arc::<T>::as_ptr(&o) as usize;
         let hasRemoved = try_init_and_get_locks().write().unwrap().remove(&p);
         if (!hasRemoved) {
@@ -197,7 +197,7 @@ pub mod Monitor_ {
     }
 
     // Not technically part of monitor, but it needs to be behind a feature switch, so cannot just dump this in Native
-    pub fn lock<T: Clone + Send + Sync, U: 'static>(toLock: Arc<T>, f: Func0<U>) -> U {
+    pub fn lock<T: Clone + Send + Sync, U: 'static>(toLock: LrcPtr<T>, f: Func0<U>) -> U {
         enter(toLock.clone());
         let returnVal = f();
         // panics will bypass this - need some finally mechanism
@@ -401,7 +401,7 @@ pub mod Task_ {
 
 #[cfg(feature = "threaded")]
 pub mod TaskBuilder_ {
-    use super::super::Native_::Lrc;
+    use super::super::Native_::LrcPtr;
     use super::Task_::Task;
     use std::sync::Arc;
 
@@ -414,8 +414,8 @@ pub mod TaskBuilder_ {
         }
     }
 
-    pub fn new() -> Lrc<TaskBuilder> {
-        Lrc::from(TaskBuilder {})
+    pub fn new() -> LrcPtr<TaskBuilder> {
+        LrcPtr::new(TaskBuilder {})
     }
 }
 
@@ -424,7 +424,7 @@ pub mod Thread_ {
     use std::thread;
     use std::time::Duration;
 
-    use crate::Native_::{Func0, Lrc, MutCell};
+    use crate::Native_::{Func0, LrcPtr, MutCell};
 
     enum ThreadInt {
         New(Func0<()>),
@@ -439,8 +439,8 @@ pub mod Thread_ {
     }
     pub struct Thread(MutCell<ThreadInt>);
 
-    pub fn new(f: Func0<()>) -> Lrc<Thread> {
-        Lrc::from(Thread(MutCell::from(ThreadInt::New(f))))
+    pub fn new(f: Func0<()>) -> LrcPtr<Thread> {
+        LrcPtr::new(Thread(MutCell::from(ThreadInt::New(f))))
     }
 
     impl Thread {

src/fable-library-rust/src/Char.rs

@@ -1,6 +1,6 @@
 pub mod Char_ {
     use crate::NativeArray_::{array_from, Array};
-    use crate::Native_::{compare, Lrc, MutCell, ToString, Vec};
+    use crate::Native_::{compare, MutCell, ToString};
     use crate::String_::{getCharAt, length, string, toString};
 
     // https://docs.microsoft.com/en-us/dotnet/api/system.globalization.unicodecategory?view=net-6.0