Significantly extended stdlib

orchid-extension/src/entrypoint.rs

@@ -261,7 +261,8 @@ impl ExtensionBuilder {
 									let text = es(text).await;
 									let src = Sym::from_api(src).await;
 									let expr_store = BorrowedExprStore::new();
-									let trigger_char = text.chars().nth(pos as usize).unwrap();
+									let tail = &text[pos as usize..];
+									let trigger_char = tail.chars().next().unwrap();
 									let ekey_na = ekey_not_applicable().await;
 									let ekey_cascade = ekey_cascade().await;
 									let lexers = cted().inst().dyn_lexers();
@@ -269,7 +270,7 @@ impl ExtensionBuilder {
 										lexers.iter().filter(|l| char_filter_match(l.char_filter(), trigger_char))
 									{
 										let ctx = LexContext::new(&expr_store, &text, id, pos, src.clone());
-										match try_with_reporter(lx.lex(&text[pos as usize..], &ctx)).await {
+										match try_with_reporter(lx.lex(tail, &ctx)).await {
 											Err(e) if e.any(|e| *e == ekey_na) => continue,
 											Err(e) => {
 												let eopt = e.keep_only(|e| *e != ekey_cascade).map(|e| Err(e.to_api()));