Fix all_trait* methods to return all trait available

Also provide a mechanism to retrieve traits and implementations for a
given crate.

compiler/stable_mir/src/lib.rs

@@ -31,7 +31,7 @@ pub use crate::error::*;
 use crate::mir::pretty::function_name;
 use crate::mir::Body;
 use crate::mir::Mutability;
-use crate::ty::{ImplDef, ImplTrait, IndexedVal, Span, TraitDecl, TraitDef, Ty};
+use crate::ty::{ImplDef, IndexedVal, Span, TraitDef, Ty};
 
 pub mod abi;
 #[macro_use]
@@ -86,6 +86,18 @@ pub struct Crate {
     pub is_local: bool,
 }
 
+impl Crate {
+    /// The list of traits declared in this crate.
+    pub fn trait_decls(&self) -> TraitDecls {
+        with(|cx| cx.trait_decls(self.id))
+    }
+
+    /// The list of trait implementations in this crate.
+    pub fn trait_impls(&self) -> ImplTraitDecls {
+        with(|cx| cx.trait_impls(self.id))
+    }
+}
+
 #[derive(Copy, Clone, PartialEq, Eq, Debug, Hash)]
 pub enum ItemKind {
     Fn,
@@ -169,18 +181,10 @@ pub fn all_trait_decls() -> TraitDecls {
     with(|cx| cx.all_trait_decls())
 }
 
-pub fn trait_decl(trait_def: &TraitDef) -> TraitDecl {
-    with(|cx| cx.trait_decl(trait_def))
-}
-
 pub fn all_trait_impls() -> ImplTraitDecls {
     with(|cx| cx.all_trait_impls())
 }
 
-pub fn trait_impl(trait_impl: &ImplDef) -> ImplTrait {
-    with(|cx| cx.trait_impl(trait_impl))
-}
-
 /// A type that provides internal information but that can still be used for debug purpose.
 #[derive(Clone, PartialEq, Eq, Hash)]
 pub struct Opaque(String);