Remove unused imports/variables

packages/core/src/runtime/skeleton.ts

@@ -20,7 +20,7 @@ import { IdentitySet } from './idcoll.js';
 import { is, Value, Record, Set, Dictionary, canonicalString, preserves, RecordConstructorInfo } from 'preserves';
 
 import { Bag, ChangeDescription } from './bag.js';
-import { Discard, Capture, Observe } from './assertions.js';
+import { Discard, Capture } from './assertions.js';
 
 import * as Stack from './stack.js';
 

packages/core/src/syntax/matcher.ts

@@ -148,7 +148,7 @@ export function group<T>(opener: string, items: Pattern<T>, options: GroupOption
 }
 
 export function atomString<T extends string>(text: T, options: TokenOptions = {}): Pattern<T> {
-    return map(atom(text, options), t => text);
+    return map(atom(text, options), _t => text);
 }
 
 export function atom(text?: string, options: TokenOptions = {}): Pattern<Token> {

packages/core/src/syntax/template.ts

@@ -1,4 +1,4 @@
-import { Items, TokenType } from './tokens.js';
+import { Items } from './tokens.js';
 import { Pos, startPos } from './position.js';
 import { laxRead } from './reader.js';
 import * as M from './matcher.js';