tamer: asg::graph::object::prelude: New module to reduce imports

These are used by virtually every `ObjectKind`; I've been meaning to do this
for a while, but now that I'm about to introduce a new one (`Doc`), let's
just get it out of the way.

DEV-13708

tamer/src/asg/graph/object.rs

@@ -151,6 +151,16 @@ pub use rel::{
 pub use root::Root;
 pub use tpl::Tpl;
 
+/// Often-needed exports for [`ObjectKind`]s.
+pub mod prelude {
+    pub use super::{
+        super::{super::error::AsgError, Asg},
+        Object, ObjectIndex, ObjectIndexRelTo, ObjectKind, ObjectRel,
+        ObjectRelFrom, ObjectRelTo, ObjectRelTy, ObjectRelatable,
+        ObjectTreeRelTo,
+    };
+}
+
 /// Given a list of [`ObjectKind`]s,
 ///   generate [`Object`],
 ///   associated types,
@@ -313,8 +323,6 @@ object_gen! {
     Ident,
 
     /// Expression.
-    ///
-    /// An expression may optionally be named by one or more [`Ident`]s.
     Expr,
 
     /// A template definition.

tamer/src/asg/graph/object/expr.rs

@@ -21,10 +21,7 @@
 
 use std::fmt::Display;
 
-use super::{
-    Asg, Ident, Object, ObjectIndex, ObjectIndexRelTo, ObjectRel,
-    ObjectRelFrom, ObjectRelTy, ObjectRelatable, ObjectTreeRelTo, Tpl,
-};
+use super::{prelude::*, Ident, Tpl};
 use crate::{
     f::Functor,
     num::Dim,

tamer/src/asg/graph/object/ident.rs

@@ -19,11 +19,7 @@
 
 //! Identifiers (a type of [object](super)).
 
-use super::{
-    super::{Asg, AsgError, ObjectIndex, ObjectKind},
-    Expr, Meta, Object, ObjectIndexRelTo, ObjectRel, ObjectRelFrom,
-    ObjectRelTo, ObjectRelTy, ObjectRelatable, ObjectTreeRelTo, Pkg, Tpl,
-};
+use super::{prelude::*, Expr, Meta, Pkg, Tpl};
 use crate::{
     diagnose::{Annotate, Diagnostic},
     diagnostic_todo,

tamer/src/asg/graph/object/meta.rs

@@ -24,12 +24,8 @@
 //!   have historically been a feature of the template system.
 //! The canonical metavariable is the template parameter.
 
-use super::{
-    Ident, Object, ObjectIndex, ObjectIndexRelTo, ObjectRel, ObjectRelFrom,
-    ObjectRelTy, ObjectRelatable, ObjectTreeRelTo, Tpl,
-};
+use super::{prelude::*, Ident, Tpl};
 use crate::{
-    asg::Asg,
     diagnose::Annotate,
     diagnostic_todo,
     f::Functor,

tamer/src/asg/graph/object/pkg.rs

@@ -19,12 +19,8 @@
 
 //! Package object on the ASG.
 
-use super::{
-    Ident, Object, ObjectIndex, ObjectIndexRelTo, ObjectRel, ObjectRelFrom,
-    ObjectRelTy, ObjectRelatable, ObjectTreeRelTo, Tpl,
-};
+use super::{prelude::*, Ident, Tpl};
 use crate::{
-    asg::Asg,
     f::Functor,
     parse::{util::SPair, Token},
     span::Span,

tamer/src/asg/graph/object/root.rs

@@ -21,10 +21,7 @@
 
 use std::fmt::Display;
 
-use super::{
-    Ident, Object, ObjectIndex, ObjectRel, ObjectRelFrom, ObjectRelTy,
-    ObjectRelatable, ObjectTreeRelTo, Pkg,
-};
+use super::{prelude::*, Ident, Pkg};
 
 #[cfg(doc)]
 use super::ObjectKind;

tamer/src/asg/graph/object/tpl.rs

@@ -21,11 +21,8 @@
 
 use std::fmt::Display;
 
-use super::{
-    Expr, Ident, Object, ObjectIndex, ObjectIndexRelTo, ObjectRel,
-    ObjectRelFrom, ObjectRelTy, ObjectRelatable, ObjectTreeRelTo,
-};
-use crate::{asg::Asg, f::Functor, span::Span};
+use super::{prelude::*, Expr, Ident};
+use crate::{f::Functor, span::Span};
 
 /// Template with associated name.
 #[derive(Debug, PartialEq, Eq)]