Merge #1076

1076: Const body inference r=flodiebold a=Lapz This is the second part of #887. I've added type inference on const bodies and introduced the DefWithBody containing Function, Const and Static. I want to add tests but im unsure on how I would go about testing that completions work. Co-authored-by: Lenard Pratt <[email protected]>
author: bors[bot] <bors[bot]@users.noreply.github.com> 2019-04-02 20:01:54 +0100
committer: bors[bot] <bors[bot]@users.noreply.github.com> 2019-04-02 20:01:54 +0100
commit: fdbebccd71d38c4dffffe918b036bbfa39355c5f (patch)
tree: 541c13ce234023bbfc640a38e55e860c029fd52c /crates
parent: 01a54f094ba7c17a6788ec706f12b07d8d60af4b (diff)
parent: b9d2c2c21fe8880fe1ca29b70b03db1d3faac554 (diff)
10 files changed, 231 insertions, 49 deletions
diff --git a/crates/ra_hir/src/code_model_api.rs b/crates/ra_hir/src/code_model_api.rs
index 87d81f4a4..9e6170440 100644
--- a/crates/ra_hir/src/code_model_api.rs
+++ b/crates/ra_hir/src/code_model_api.rs
@@ -429,6 +429,45 @@ impl Docs for EnumVariant {
    }
 }
+/// The defs which have a body.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub enum DefWithBody {
+    Function(Function),
+    Const(Const),
+    Static(Static),
+}
+impl_froms!(DefWithBody: Function, Const, Static);
+impl DefWithBody {
+    pub fn infer(&self, db: &impl HirDatabase) -> Arc<InferenceResult> {
+        db.infer(*self)
+    }
+    pub fn body_source_map(&self, db: &impl HirDatabase) -> Arc<BodySourceMap> {
+        db.body_with_source_map(*self).1
+    }
+    pub fn body(&self, db: &impl HirDatabase) -> Arc<Body> {
+        db.body_hir(*self)
+    }
+    /// Builds a resolver for code inside this item.
+    pub fn resolver(&self, db: &impl HirDatabase) -> Resolver {
+        match *self {
+            DefWithBody::Const(ref c) => c.resolver(db),
+            DefWithBody::Function(ref f) => f.resolver(db),
+            DefWithBody::Static(ref s) => s.resolver(db),
+        }
+    }
+    pub fn scopes(&self, db: &impl HirDatabase) -> ScopesWithSourceMap {
+        let scopes = db.expr_scopes(*self);
+        let source_map = db.body_with_source_map(*self).1;
+        ScopesWithSourceMap { scopes, source_map }
+    }
+}
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 pub struct Function {
    pub(crate) id: FunctionId,
@@ -479,11 +518,11 @@ impl Function {
    }
    pub fn body_source_map(&self, db: &impl HirDatabase) -> Arc<BodySourceMap> {
-        db.body_with_source_map(*self).1
+        db.body_with_source_map((*self).into()).1
    }
    pub fn body(&self, db: &impl HirDatabase) -> Arc<Body> {
-        db.body_hir(*self)
+        db.body_hir((*self).into())
    }
    pub fn ty(&self, db: &impl HirDatabase) -> Ty {
@@ -491,8 +530,8 @@ impl Function {
    }
    pub fn scopes(&self, db: &impl HirDatabase) -> ScopesWithSourceMap {
-        let scopes = db.expr_scopes(*self);
+        let scopes = db.expr_scopes((*self).into());
-        let source_map = db.body_with_source_map(*self).1;
+        let source_map = db.body_with_source_map((*self).into()).1;
        ScopesWithSourceMap { scopes, source_map }
    }
@@ -501,7 +540,7 @@ impl Function {
    }
    pub fn infer(&self, db: &impl HirDatabase) -> Arc<InferenceResult> {
-        db.infer(*self)
+        db.infer((*self).into())
    }
    pub fn generic_params(&self, db: &impl DefDatabase) -> Arc<GenericParams> {
@@ -557,6 +596,14 @@ impl Const {
        db.const_signature(*self)
    }
+    pub fn infer(&self, db: &impl HirDatabase) -> Arc<InferenceResult> {
+        db.infer((*self).into())
+    }
+    pub fn body_source_map(&self, db: &impl HirDatabase) -> Arc<BodySourceMap> {
+        db.body_with_source_map((*self).into()).1
+    }
    /// The containing impl block, if this is a method.
    pub fn impl_block(&self, db: &impl DefDatabase) -> Option<ImplBlock> {
        let module_impls = db.impls_in_module(self.module(db));
@@ -621,6 +668,14 @@ impl Static {
        // take the outer scope...
        self.module(db).resolver(db)
    }
+    pub fn infer(&self, db: &impl HirDatabase) -> Arc<InferenceResult> {
+        db.infer((*self).into())
+    }
+    pub fn body_source_map(&self, db: &impl HirDatabase) -> Arc<BodySourceMap> {
+        db.body_with_source_map((*self).into()).1
+    }
 }
 impl Docs for Static {
diff --git a/crates/ra_hir/src/db.rs b/crates/ra_hir/src/db.rs
index 147005848..be8a8c98b 100644
--- a/crates/ra_hir/src/db.rs
+++ b/crates/ra_hir/src/db.rs
@@ -8,6 +8,7 @@ use crate::{
    Function, FnSignature, ExprScopes, TypeAlias,
    Struct, Enum, StructField,
    Const, ConstSignature, Static,
+    DefWithBody,
    nameres::{Namespace, ImportSourceMap, RawItems, CrateDefMap},
    ty::{InferenceResult, Ty, method_resolution::CrateImplBlocks, TypableDef, CallableDef, FnSig},
    adt::{StructData, EnumData},
@@ -83,10 +84,10 @@ pub trait DefDatabase: SourceDatabase + AsRef<HirInterner> {
 #[salsa::query_group(HirDatabaseStorage)]
 pub trait HirDatabase: DefDatabase {
    #[salsa::invoke(ExprScopes::expr_scopes_query)]
-    fn expr_scopes(&self, func: Function) -> Arc<ExprScopes>;
+    fn expr_scopes(&self, def: DefWithBody) -> Arc<ExprScopes>;
    #[salsa::invoke(crate::ty::infer)]
-    fn infer(&self, func: Function) -> Arc<InferenceResult>;
+    fn infer(&self, def: DefWithBody) -> Arc<InferenceResult>;
    #[salsa::invoke(crate::ty::type_for_def)]
    fn type_for_def(&self, def: TypableDef, ns: Namespace) -> Ty;
@@ -100,11 +101,11 @@ pub trait HirDatabase: DefDatabase {
    #[salsa::invoke(crate::expr::body_with_source_map_query)]
    fn body_with_source_map(
        &self,
-        func: Function,
+        def: DefWithBody,
    ) -> (Arc<crate::expr::Body>, Arc<crate::expr::BodySourceMap>);
    #[salsa::invoke(crate::expr::body_hir_query)]
-    fn body_hir(&self, func: Function) -> Arc<crate::expr::Body>;
+    fn body_hir(&self, def: DefWithBody) -> Arc<crate::expr::Body>;
    #[salsa::invoke(crate::ty::method_resolution::CrateImplBlocks::impls_in_crate_query)]
    fn impls_in_crate(&self, krate: Crate) -> Arc<CrateImplBlocks>;
diff --git a/crates/ra_hir/src/expr.rs b/crates/ra_hir/src/expr.rs
index 45012827f..b2a237ece 100644
--- a/crates/ra_hir/src/expr.rs
+++ b/crates/ra_hir/src/expr.rs
@@ -10,7 +10,7 @@ use ra_syntax::{
 };
 use crate::{
-    Path, Name, HirDatabase, Function, Resolver,
+    Path, Name, HirDatabase, Resolver,DefWithBody,
    name::AsName,
    type_ref::{Mutability, TypeRef},
 };
@@ -27,9 +27,8 @@ impl_arena_id!(ExprId);
 /// The body of an item (function, const etc.).
 #[derive(Debug, Eq, PartialEq)]
 pub struct Body {
-    // FIXME: this should be more general, consts & statics also have bodies
+    /// The def of the item this body belongs to
-    /// The Function of the item this body belongs to
+    owner: DefWithBody,
-    owner: Function,
    exprs: Arena<ExprId, Expr>,
    pats: Arena<PatId, Pat>,
    /// The patterns for the function's parameters. While the parameter types are
@@ -66,7 +65,7 @@ impl Body {
        self.body_expr
    }
-    pub fn owner(&self) -> Function {
+    pub fn owner(&self) -> DefWithBody {
        self.owner
    }
@@ -463,8 +462,8 @@ impl Pat {
 // Queries
-struct ExprCollector {
+pub(crate) struct ExprCollector {
-    owner: Function,
+    owner: DefWithBody,
    exprs: Arena<ExprId, Expr>,
    pats: Arena<PatId, Pat>,
    source_map: BodySourceMap,
@@ -473,7 +472,7 @@ struct ExprCollector {
 }
 impl ExprCollector {
-    fn new(owner: Function) -> Self {
+    fn new(owner: DefWithBody) -> Self {
        ExprCollector {
            owner,
            exprs: Arena::default(),
@@ -866,6 +865,16 @@ impl ExprCollector {
        }
    }
+    fn collect_const_body(&mut self, node: &ast::ConstDef) {
+        let body = self.collect_expr_opt(node.body());
+        self.body_expr = Some(body);
+    }
+    fn collect_static_body(&mut self, node: &ast::StaticDef) {
+        let body = self.collect_expr_opt(node.body());
+        self.body_expr = Some(body);
+    }
    fn collect_fn_body(&mut self, node: &ast::FnDef) {
        if let Some(param_list) = node.param_list() {
            if let Some(self_param) = param_list.self_param() {
@@ -910,24 +919,20 @@ impl ExprCollector {
 pub(crate) fn body_with_source_map_query(
    db: &impl HirDatabase,
-    func: Function,
+    def: DefWithBody,
 ) -> (Arc<Body>, Arc<BodySourceMap>) {
-    let mut collector = ExprCollector::new(func);
+    let mut collector = ExprCollector::new(def);
-    // FIXME: consts, etc.
+    match def {
-    collector.collect_fn_body(&func.source(db).1);
+        DefWithBody::Const(ref c) => collector.collect_const_body(&c.source(db).1),
+        DefWithBody::Function(ref f) => collector.collect_fn_body(&f.source(db).1),
+        DefWithBody::Static(ref s) => collector.collect_static_body(&s.source(db).1),
+    }
    let (body, source_map) = collector.finish();
    (Arc::new(body), Arc::new(source_map))
 }
-pub(crate) fn body_hir_query(db: &impl HirDatabase, func: Function) -> Arc<Body> {
+pub(crate) fn body_hir_query(db: &impl HirDatabase, def: DefWithBody) -> Arc<Body> {
-    db.body_with_source_map(func).0
+    db.body_with_source_map(def).0
-}
-#[cfg(test)]
-fn collect_fn_body_syntax(function: Function, node: &ast::FnDef) -> (Body, BodySourceMap) {
-    let mut collector = ExprCollector::new(function);
-    collector.collect_fn_body(node);
-    collector.finish()
 }
diff --git a/crates/ra_hir/src/expr/scope.rs b/crates/ra_hir/src/expr/scope.rs
index ed005c9f7..48283907b 100644
--- a/crates/ra_hir/src/expr/scope.rs
+++ b/crates/ra_hir/src/expr/scope.rs
@@ -10,7 +10,7 @@ use ra_syntax::{
 use ra_arena::{Arena, RawId, impl_arena_id};
 use crate::{
-    Name, AsName, Function,
+    Name, AsName,DefWithBody,
    expr::{PatId, ExprId, Pat, Expr, Body, Statement, BodySourceMap},
    HirDatabase,
 };
@@ -40,8 +40,8 @@ pub struct ScopeData {
 impl ExprScopes {
    // FIXME: This should take something more general than Function
-    pub(crate) fn expr_scopes_query(db: &impl HirDatabase, function: Function) -> Arc<ExprScopes> {
+    pub(crate) fn expr_scopes_query(db: &impl HirDatabase, def: DefWithBody) -> Arc<ExprScopes> {
-        let body = db.body_hir(function);
+        let body = db.body_hir(def);
        let res = ExprScopes::new(body);
        Arc::new(res)
    }
@@ -297,8 +297,9 @@ mod tests {
    use ra_syntax::{SourceFile, algo::find_node_at_offset};
    use test_utils::{extract_offset, assert_eq_text};
    use ra_arena::ArenaId;
+    use crate::Function;
-    use crate::expr;
+    use crate::expr::{ExprCollector};
    use super::*;
@@ -316,7 +317,7 @@ mod tests {
        let marker: &ast::PathExpr = find_node_at_offset(file.syntax(), off).unwrap();
        let fn_def: &ast::FnDef = find_node_at_offset(file.syntax(), off).unwrap();
        let irrelevant_function = Function { id: crate::ids::FunctionId::from_raw(0.into()) };
-        let (body, source_map) = expr::collect_fn_body_syntax(irrelevant_function, fn_def);
+        let (body, source_map) = collect_fn_body_syntax(irrelevant_function, fn_def);
        let scopes = ExprScopes::new(Arc::new(body));
        let scopes =
            ScopesWithSourceMap { scopes: Arc::new(scopes), source_map: Arc::new(source_map) };
@@ -405,6 +406,12 @@ mod tests {
        );
    }
+    fn collect_fn_body_syntax(function: Function, node: &ast::FnDef) -> (Body, BodySourceMap) {
+        let mut collector = ExprCollector::new(DefWithBody::Function(function));
+        collector.collect_fn_body(node);
+        collector.finish()
+    }
    fn do_check_local_name(code: &str, expected_offset: u32) {
        let (off, code) = extract_offset(code);
        let file = SourceFile::parse(&code);
@@ -415,7 +422,7 @@ mod tests {
        let name_ref: &ast::NameRef = find_node_at_offset(file.syntax(), off).unwrap();
        let irrelevant_function = Function { id: crate::ids::FunctionId::from_raw(0.into()) };
-        let (body, source_map) = expr::collect_fn_body_syntax(irrelevant_function, fn_def);
+        let (body, source_map) = collect_fn_body_syntax(irrelevant_function, fn_def);
        let scopes = ExprScopes::new(Arc::new(body));
        let scopes =
            ScopesWithSourceMap { scopes: Arc::new(scopes), source_map: Arc::new(source_map) };
diff --git a/crates/ra_hir/src/lib.rs b/crates/ra_hir/src/lib.rs
index 643bee6cd..c19450f39 100644
--- a/crates/ra_hir/src/lib.rs
+++ b/crates/ra_hir/src/lib.rs
@@ -67,6 +67,7 @@ pub use self::{
 pub use self::code_model_api::{
    Crate, CrateDependency,
+    DefWithBody,
    Module, ModuleDef, ModuleSource,
    Struct, Enum, EnumVariant,
    Function, FnSignature,
diff --git a/crates/ra_hir/src/source_binder.rs b/crates/ra_hir/src/source_binder.rs
index 54dc27399..182ed4c91 100644
--- a/crates/ra_hir/src/source_binder.rs
+++ b/crates/ra_hir/src/source_binder.rs
@@ -13,7 +13,7 @@ use ra_syntax::{
 };
 use crate::{
-    HirDatabase, Function, Struct, Enum,
+    HirDatabase, Function, Struct, Enum,Const,Static,
    AsName, Module, HirFileId, Crate, Trait, Resolver,
    ids::LocationCtx,
    expr, AstId
@@ -87,6 +87,27 @@ fn module_from_source(
    )
 }
+pub fn const_from_source(
+    db: &impl HirDatabase,
+    file_id: FileId,
+    const_def: &ast::ConstDef,
+) -> Option<Const> {
+    let module = module_from_child_node(db, file_id, const_def.syntax())?;
+    let res = const_from_module(db, module, const_def);
+    Some(res)
+}
+pub fn const_from_module(
+    db: &impl HirDatabase,
+    module: Module,
+    const_def: &ast::ConstDef,
+) -> Const {
+    let (file_id, _) = module.definition_source(db);
+    let file_id = file_id.into();
+    let ctx = LocationCtx::new(db, module, file_id);
+    Const { id: ctx.to_def(const_def) }
+}
 pub fn function_from_position(db: &impl HirDatabase, position: FilePosition) -> Option<Function> {
    let file = db.parse(position.file_id);
    let fn_def = find_node_at_offset::<ast::FnDef>(file.syntax(), position.offset)?;
@@ -134,6 +155,27 @@ pub fn struct_from_module(
    Struct { id: ctx.to_def(struct_def) }
 }
+pub fn static_from_source(
+    db: &impl HirDatabase,
+    file_id: FileId,
+    static_def: &ast::StaticDef,
+) -> Option<Static> {
+    let module = module_from_child_node(db, file_id, static_def.syntax())?;
+    let res = static_from_module(db, module, static_def);
+    Some(res)
+}
+pub fn static_from_module(
+    db: &impl HirDatabase,
+    module: Module,
+    static_def: &ast::StaticDef,
+) -> Static {
+    let (file_id, _) = module.definition_source(db);
+    let file_id = file_id.into();
+    let ctx = LocationCtx::new(db, module, file_id);
+    Static { id: ctx.to_def(static_def) }
+}
 pub fn enum_from_module(db: &impl HirDatabase, module: Module, enum_def: &ast::EnumDef) -> Enum {
    let (file_id, _) = module.definition_source(db);
    let file_id = file_id.into();
diff --git a/crates/ra_hir/src/ty/infer.rs b/crates/ra_hir/src/ty/infer.rs
index 573115321..887153484 100644
--- a/crates/ra_hir/src/ty/infer.rs
+++ b/crates/ra_hir/src/ty/infer.rs
@@ -27,8 +27,9 @@ use test_utils::tested_by;
 use crate::{
    Function, StructField, Path, Name,
-    FnSignature, AdtDef,
+    FnSignature, AdtDef,ConstSignature,
    HirDatabase,
+    DefWithBody,
    ImplItem,
    type_ref::{TypeRef, Mutability},
    expr::{Body, Expr, BindingAnnotation, Literal, ExprId, Pat, PatId, UnaryOp, BinaryOp, Statement, FieldPat, self},
@@ -43,14 +44,17 @@ use crate::{
 use super::{Ty, TypableDef, Substs, primitive, op, FnSig, ApplicationTy, TypeCtor};
 /// The entry point of type inference.
-pub fn infer(db: &impl HirDatabase, func: Function) -> Arc<InferenceResult> {
+pub fn infer(db: &impl HirDatabase, def: DefWithBody) -> Arc<InferenceResult> {
    db.check_canceled();
-    let body = func.body(db);
+    let body = def.body(db);
-    let resolver = func.resolver(db);
+    let resolver = def.resolver(db);
    let mut ctx = InferenceContext::new(db, body, resolver);
-    let signature = func.signature(db);
+    match def {
-    ctx.collect_fn_signature(&signature);
+        DefWithBody::Const(ref c) => ctx.collect_const_signature(&c.signature(db)),
+        DefWithBody::Function(ref f) => ctx.collect_fn_signature(&f.signature(db)),
+        DefWithBody::Static(ref s) => ctx.collect_const_signature(&s.signature(db)),
+    }
    ctx.infer_body();
@@ -1142,6 +1146,10 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
        ty
    }
+    fn collect_const_signature(&mut self, signature: &ConstSignature) {
+        self.return_ty = self.make_ty(signature.type_ref());
+    }
    fn collect_fn_signature(&mut self, signature: &FnSignature) {
        let body = Arc::clone(&self.body); // avoid borrow checker problem
        for (type_ref, pat) in signature.params().iter().zip(body.params()) {
diff --git a/crates/ra_hir/src/ty/tests.rs b/crates/ra_hir/src/ty/tests.rs
index 943c5499b..0b7c841df 100644
--- a/crates/ra_hir/src/ty/tests.rs
+++ b/crates/ra_hir/src/ty/tests.rs
@@ -11,6 +11,8 @@ use crate::{
    source_binder,
    mock::MockDatabase,
    ty::display::HirDisplay,
+    ty::InferenceResult,
+    expr::BodySourceMap
 };
 // These tests compare the inference results for all expressions in a file
@@ -1267,6 +1269,9 @@ fn test() {
 }
 "#),
        @r###"
+[52; 53) '1': u32
+[103; 104) '2': u32
+[211; 212) '5': u32
 [227; 305) '{     ...:ID; }': ()
 [237; 238) 'x': u32
 [241; 252) 'Struct::FOO': u32
@@ -1855,6 +1860,9 @@ fn test() {
 }
 "#),
        @r###"
+[49; 50) '0': u32
+[80; 83) '101': u32
+[126; 128) '99': u32
 [95; 213) '{     ...NST; }': ()
 [138; 139) 'x': {unknown}
 [142; 153) 'LOCAL_CONST': {unknown}
@@ -1881,6 +1889,10 @@ fn test() {
 }
 "#),
        @r###"
+[29; 32) '101': u32
+[70; 73) '101': u32
+[118; 120) '99': u32
+[161; 163) '99': u32
 [85; 280) '{     ...MUT; }': ()
 [173; 174) 'x': {unknown}
 [177; 189) 'LOCAL_STATIC': {unknown}
@@ -2212,6 +2224,24 @@ fn test<T: Iterable<Item=u32>>() {
    );
 }
+#[test]
+fn infer_const_body() {
+    assert_snapshot_matches!(
+        infer(r#"
+const A: u32 = 1 + 1;
+static B: u64 = { let x = 1; x };
+"#),
+        @r###"
+[16; 17) '1': u32
+[16; 21) '1 + 1': u32
+[20; 21) '1': u32
+[39; 55) '{ let ...1; x }': u64
+[45; 46) 'x': u64
+[49; 50) '1': u64
+[52; 53) 'x': u64"###
+    );
+}
 fn type_at_pos(db: &MockDatabase, pos: FilePosition) -> String {
    let func = source_binder::function_from_position(db, pos).unwrap();
    let body_source_map = func.body_source_map(db);
@@ -2228,11 +2258,11 @@ fn infer(content: &str) -> String {
    let source_file = db.parse(file_id);
    let mut acc = String::new();
    acc.push_str("\n");
-    for fn_def in source_file.syntax().descendants().filter_map(ast::FnDef::cast) {
-        let func = source_binder::function_from_source(&db, file_id, fn_def).unwrap();
+    let mut infer_def = |inference_result: Arc<InferenceResult>,
-        let inference_result = func.infer(&db);
+                         body_source_map: Arc<BodySourceMap>| {
-        let body_source_map = func.body_source_map(&db);
        let mut types = Vec::new();
        for (pat, ty) in inference_result.type_of_pat.iter() {
            let syntax_ptr = match body_source_map.pat_syntax(pat) {
                Some(sp) => sp,
@@ -2240,6 +2270,7 @@ fn infer(content: &str) -> String {
            };
            types.push((syntax_ptr, ty));
        }
        for (expr, ty) in inference_result.type_of_expr.iter() {
            let syntax_ptr = match body_source_map.expr_syntax(expr) {
                Some(sp) => sp,
@@ -2258,7 +2289,29 @@ fn infer(content: &str) -> String {
            };
            write!(acc, "{} '{}': {}\n", range, ellipsize(text, 15), ty.display(&db)).unwrap();
        }
+    };
+    for const_def in source_file.syntax().descendants().filter_map(ast::ConstDef::cast) {
+        let konst = source_binder::const_from_source(&db, file_id, const_def).unwrap();
+        let inference_result = konst.infer(&db);
+        let body_source_map = konst.body_source_map(&db);
+        infer_def(inference_result, body_source_map)
    }
+    for static_def in source_file.syntax().descendants().filter_map(ast::StaticDef::cast) {
+        let static_ = source_binder::static_from_source(&db, file_id, static_def).unwrap();
+        let inference_result = static_.infer(&db);
+        let body_source_map = static_.body_source_map(&db);
+        infer_def(inference_result, body_source_map)
+    }
+    for fn_def in source_file.syntax().descendants().filter_map(ast::FnDef::cast) {
+        let func = source_binder::function_from_source(&db, file_id, fn_def).unwrap();
+        let inference_result = func.infer(&db);
+        let body_source_map = func.body_source_map(&db);
+        infer_def(inference_result, body_source_map)
+    }
    acc.truncate(acc.trim_end().len());
    acc
 }
diff --git a/crates/ra_syntax/src/ast/generated.rs b/crates/ra_syntax/src/ast/generated.rs
index c2e89de15..0376c91c8 100644
--- a/crates/ra_syntax/src/ast/generated.rs
+++ b/crates/ra_syntax/src/ast/generated.rs
@@ -513,7 +513,11 @@ impl ast::TypeParamsOwner for ConstDef {}
 impl ast::AttrsOwner for ConstDef {}
 impl ast::DocCommentsOwner for ConstDef {}
 impl ast::TypeAscriptionOwner for ConstDef {}
-impl ConstDef {}
+impl ConstDef {
+    pub fn body(&self) -> Option<&Expr> {
+        super::child_opt(self)
+    }
+}
 // ContinueExpr
 #[derive(Debug, PartialEq, Eq, Hash)]
@@ -3364,7 +3368,11 @@ impl ast::TypeParamsOwner for StaticDef {}
 impl ast::AttrsOwner for StaticDef {}
 impl ast::DocCommentsOwner for StaticDef {}
 impl ast::TypeAscriptionOwner for StaticDef {}
-impl StaticDef {}
+impl StaticDef {
+    pub fn body(&self) -> Option<&Expr> {
+        super::child_opt(self)
+    }
+}
 // Stmt
 #[derive(Debug, PartialEq, Eq, Hash)]
diff --git a/crates/ra_syntax/src/grammar.ron b/crates/ra_syntax/src/grammar.ron
index dc0de5808..0a35e25d5 100644
--- a/crates/ra_syntax/src/grammar.ron
+++ b/crates/ra_syntax/src/grammar.ron
@@ -315,6 +315,7 @@ Grammar(
                "DocCommentsOwner",
                "TypeAscriptionOwner",
            ],
+            options: [ ["body","Expr"]],
        ),
        "StaticDef": (
            traits: [
@@ -325,6 +326,7 @@ Grammar(
                "DocCommentsOwner",
                "TypeAscriptionOwner",
            ],
+            options: [ ["body","Expr"]],
        ),
        "TypeAliasDef": (
            traits: [
author	bors[bot] <bors[bot]@users.noreply.github.com>	2019-04-02 20:01:54 +0100
committer	bors[bot] <bors[bot]@users.noreply.github.com>	2019-04-02 20:01:54 +0100
commit	fdbebccd71d38c4dffffe918b036bbfa39355c5f (patch)
tree	541c13ce234023bbfc640a38e55e860c029fd52c /crates
parent	01a54f094ba7c17a6788ec706f12b07d8d60af4b (diff)
parent	b9d2c2c21fe8880fe1ca29b70b03db1d3faac554 (diff)