Add equality and hash traits to core AST nodes

Core AST nodes such as `Ident`, `TypeRef`, and `QualifiedIdent` now
derive `PartialEq`, `Eq`, and `Hash`. This allows them to be compared for
equality and used in hash-based collections, a prerequisite for upcoming
semantic analysis features.

This also includes minor cleanup by removing several unnecessary clippy
`expect` attributes from test modules.

Author: mkpro118

src/core/parser/ast/mod.rs

@@ -607,7 +607,7 @@ pub struct BlockAttribute {
 /// assert!(q.is_simple());
 /// assert_eq!(q.as_simple().unwrap().text, "String");
 /// ```
-#[derive(Debug, Clone, AstContainerNode)]
+#[derive(Debug, Clone, PartialEq, Eq, Hash, AstContainerNode)]
 pub struct QualifiedIdent {
     /// The identifier parts (e.g., `["db", "VarChar"]`).
     pub parts: Vec<Ident>,
@@ -660,7 +660,7 @@ impl QualifiedIdent {
 /// assert_eq!(named.node_type(), "NamedType");
 /// assert_eq!(list.node_type(), "ListType");
 /// ```
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub enum TypeRef {
     /// A named type (scalar, enum, or model reference).
     Named(NamedType),
@@ -713,7 +713,7 @@ impl AstNode for TypeRef {
 /// };
 /// assert_eq!(nt.node_type(), "NamedType");
 /// ```
-#[derive(Debug, Clone, AstContainerNode)]
+#[derive(Debug, Clone, PartialEq, Eq, Hash, AstContainerNode)]
 pub struct NamedType {
     /// The type name (may be qualified for built-ins).
     pub name: QualifiedIdent,
@@ -743,7 +743,7 @@ pub struct NamedType {
 /// let list = ListType { inner: Box::new(inner), span: sp((1,1),(1,6)) };
 /// assert_eq!(list.node_type(), "ListType");
 /// ```
-#[derive(Debug, Clone, AstContainerNode)]
+#[derive(Debug, Clone, PartialEq, Eq, Hash, AstContainerNode)]
 pub struct ListType {
     /// The inner type.
     pub inner: Box<TypeRef>,
@@ -1076,7 +1076,7 @@ impl AstNode for ObjectKey {}
 /// An identifier with its source text and span.
 ///
 /// Keeps the original identifier text and a span over it.
-#[derive(Debug, Clone, AstLeafNode)]
+#[derive(Debug, Clone, PartialEq, Eq, Hash, AstLeafNode)]
 pub struct Ident {
     /// The identifier text.
     pub text: String,

src/core/parser/components/attributes.rs

@@ -802,8 +802,6 @@ impl Parser<BlockAttribute> for BlockAttributeParser {
 
 #[cfg(test)]
 mod tests {
-    #![expect(clippy::unwrap_used)]
-
     use crate::core::parser::ParserOptions;
     use crate::core::parser::VectorTokenStream;
     use crate::core::parser::ast::Arg;

src/core/parser/components/declarations.rs

@@ -810,8 +810,6 @@ impl DeclarationWrapper<TypeDecl> for TypeDeclParser {
 
 #[cfg(test)]
 mod tests {
-    #![expect(clippy::unwrap_used)]
-
     use crate::core::parser::components::declarations::{
         DatasourceParser, EnumParser, GeneratorParser, ModelParser,
         TypeDeclParser,

src/core/parser/components/members.rs

@@ -606,8 +606,6 @@ impl Parser<EnumMember> for EnumMemberParser {
 
 #[cfg(test)]
 mod tests {
-    #![expect(clippy::expect_used, clippy::unwrap_used)]
-
     use crate::core::parser::ast::{
         EnumMember, Expr, HasNodeType, ModelMember, NamedType, TypeRef,
     };

src/core/parser/components/primitives.rs

@@ -300,8 +300,6 @@ impl Parser<QualifiedIdent> for QualifiedIdentParser {
 
 #[cfg(test)]
 mod tests {
-    #![expect(clippy::unwrap_used)]
-
     use crate::core::parser::components::primitives::{
         IdentParser, QualifiedIdentParser,
     };

src/core/parser/components/types.rs

@@ -336,8 +336,6 @@ impl Parser<TypeRef> for TypeRefParser {
 
 #[cfg(test)]
 mod tests {
-    #![expect(clippy::unwrap_used, clippy::expect_used)]
-
     use crate::core::parser::components::types::{
         NamedTypeParser, TypeRefParser,
     };

src/core/parser/config.rs

@@ -241,7 +241,6 @@ impl<T> ParseResult<T> {
 
 #[cfg(test)]
 mod config_tests {
-    #![expect(clippy::unwrap_used)]
     use super::*;
     use crate::core::scanner::tokens::{SymbolLocation, SymbolSpan};
 

src/core/parser/progress.rs

@@ -250,7 +250,6 @@ impl TokenStream for ObservedTokenStream<'_> {
 
 #[cfg(test)]
 mod tests {
-    #![expect(clippy::expect_used)]
     use super::*;
     use crate::core::parser::stream::VectorTokenStream;
 

src/core/parser/schema_parser.rs

@@ -546,7 +546,6 @@ struct Block {
 
 #[cfg(test)]
 mod tests {
-    #![expect(clippy::unwrap_used)]
     use super::*;
     use std::sync::{
         Arc,

src/core/parser/stream.rs

@@ -399,8 +399,6 @@ impl<T: ?Sized + TokenStream> TokenStreamExt for T {}
 
 #[cfg(test)]
 mod tests {
-    #![expect(clippy::expect_used, clippy::unwrap_used)]
-
     use super::*;
 
     fn create_test_token(token_type: TokenType) -> Token {