Add parser values

[dhedey]

No description provided.

[Copilot]

Pull request overview

This PR introduces a new Parser value type to enable programmatic parsing of token streams. The implementation uses a handle-based system with SlotMap for managing parse contexts, replacing the previous stack-only approach.

Key changes:

• Adds Parser as a new value kind with methods for parsing identifiers, literals, punctuation, and token trees
• Implements parse X => |Y| { } expression syntax for creating parser scopes
• Migrates from stack-based to handle-based parser management using SlotMap for better lifetime safety

Reviewed changes

Copilot reviewed 30 out of 30 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/expressions/parser.rs	New file implementing ParserExpression with parsing methods (ident, punct, literal, etc.)
src/expressions/control_flow.rs	Adds ParseExpression struct implementing the parse => |input| {} syntax
src/interpretation/input_handler.rs	Refactored to use SlotMap instead of Vec for managing parse stacks
src/interpretation/interpreter.rs	Updated start_parse to return ParserHandle and accept handle parameter in closure
src/expressions/value.rs	Adds Parser variant to ExpressionValue enum with cloneable handle semantics
src/misc/keywords.rs	Adds "parse" as a new keyword
src/expressions/expression_parsing.rs	Integrates ParseExpression into expression parser with improved error message
src/expressions/type_resolution/interface_macros.rs	Adds [ignore_type_assertion] attribute for methods with complex return types
src/extensions/errors_and_spans.rs	Removes wrapper methods start() and end(), uses direct field access instead
tests/parsing.rs	New test file for parser functionality
tests/literal.rs	Adds tests for to_literal().to_debug_string() round-tripping
Cargo.toml	Adds slotmap dependency for handle-based parser management

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[Copilot]

Typo in function name: "transfoming" should be "transforming"

Suggested change

	fn test_transfoming_compilation_failures() {
	fn test_transforming_compilation_failures() {

[Copilot]

Typo in comment: "to can be cloned" should be "so can be cloned"

Suggested change

	// A parser is a handle, to can be cloned transparently.
	// A parser is a handle, so can be cloned transparently.

[Copilot]

Typo in error message: "propogate" should be "propagate"

Suggested change

	self.braces.control_flow_err("No attempt arm ran successfully. You may wish to add a fallback arm `{} => { None }` to ignore the error or to propogate a better message: `{} => { %[<tokens for error span>].error(\"Error message\") }`.")
	self.braces.control_flow_err("No attempt arm ran successfully. You may wish to add a fallback arm `{} => { None }` to ignore the error or to propagate a better message: `{} => { %[<tokens for error span>].error(\"Error message\") }`.")