fix: validate line numbers on split bank

__tests__/fixtures/bank-split-numbers.txt

@@ -0,0 +1,22 @@
+#autostart 1
+5 RUN AT 3: PRINT "<<< MULTI_BANK_OUTPUT >>>"
+10 LOAD "BANK20" BANK 20
+15 LOAD "BANK21" BANK 21
+17 LOAD "BANK22" BANK 22
+20 PRINT "BASIC ON THE..."
+30 BANK 20 GO SUB 30
+35 BANK 21 GO SUB 30
+37 BANK 22 GO SUB 30
+40 GO TO 20
+
+#bankfile BANK20
+30 PRINT "20 ZX"
+40 RETURN
+
+#bankfile BANK21
+30 PRINT "21 SPECTRUM"
+40 RETURN
+
+#bankfile BANK22
+30 PRINT "22 NEXT!"
+40 RETURN

__tests__/validate.test.js

@@ -52,6 +52,17 @@ test('hex looking like dec', (t) => {
   });
 });
 
+test('#bank splitting resets line numbers', async (t) => {
+  let fixture = await readFile(
+    __dirname + '/fixtures/bank-split-numbers.txt',
+    'utf8'
+  );
+  fixture = fixture.split('\n').slice(2).join('\n');
+  const res = validateTxt(fixture);
+
+  t.deepEqual(res, [], 'no validation errors');
+});
+
 function throws(src, expect, { debug, message } = {}) {
   test(src, (t) => {
     t.throws(

txt2bas/index.js

@@ -161,6 +161,11 @@ export function validate(text, debug = {}) {
         if (line.startsWith('#autoline')) {
           autoline.parse(line);
         }
+
+        if (line.startsWith('#bank')) {
+          autoline.reset();
+          lastLine = -1;
+        }
         // skip
       } else {
         let ln;