Various progress, doesnt compile

Added prelude, made lambdas a single-token prefix like NS, made progress on implementations, removed const line type

orchid-api/src/parser.rs

@@ -59,7 +59,7 @@ pub struct ParsedMember {
 #[derive(Clone, Debug, Coding)]
 pub enum ParsedMemberKind {
 	Constant(ParsedConstId),
-	Module(Vec<ParsedLine>),
+	Module { lines: Vec<ParsedLine>, use_prelude: bool },
 }
 
 /// Obtain the value of a parsed constant. This is guaranteed to be called after

orchid-api/src/system.rs

@@ -5,7 +5,7 @@ use orchid_api_derive::{Coding, Hierarchy};
 use orchid_api_traits::Request;
 use ordered_float::NotNan;
 
-use crate::{CharFilter, ExtHostReq, HostExtNotif, HostExtReq, MemberKind, TStr};
+use crate::{CharFilter, ExtHostReq, HostExtNotif, HostExtReq, MemberKind, TStr, TStrv};
 
 /// ID of a system type
 #[derive(Copy, Clone, Debug, Hash, PartialEq, Eq, PartialOrd, Ord, Coding)]
@@ -63,6 +63,7 @@ pub struct NewSystemResponse {
 	pub lex_filter: CharFilter,
 	pub line_types: Vec<TStr>,
 	pub const_root: HashMap<TStr, MemberKind>,
+	pub prelude: Vec<TStrv>,
 }
 
 #[derive(Clone, Debug, Coding, Hierarchy)]

orchid-api/src/tree.rs

@@ -27,7 +27,7 @@ pub struct TokenTree {
 #[derive(Clone, Debug, Coding)]
 pub enum Token {
 	/// Lambda function head, from the opening \ until the beginning of the body.
-	LambdaHead(Vec<TokenTree>),
+	LambdaHead(Box<TokenTree>),
 	/// A name segment or an operator.
 	Name(TStr),
 	/// A newly generated expression. The last place this is supposed to happen is