scanner: fix when string literal ends after } (#7237)

.github/workflows/ci.yml

@@ -596,8 +596,8 @@ jobs:
             name: client wss
             path: ${{github.workspace}}/reports_wss/clients/index.html
 
-  parser-silent-hello-world:
-    name: Parser silent mode - examples/hello_world.v
+  parser-silent:
+    name: Parser silent mode
     runs-on: ubuntu-latest
     timeout-minutes: 30
     steps:
@@ -607,3 +607,4 @@ jobs:
     - name: Run test-parser
       run: |
         ./v test-parser examples/hello_world.v
+        ./v test-parser examples/hanoi.v

vlib/v/scanner/scanner.v

@@ -719,7 +719,11 @@ fn (mut s Scanner) text_scan() token.Token {
 				// s = `hello $name !`
 				// s = `hello ${name} !`
 				if s.is_enclosed_inter {
-					s.pos++
+					if s.pos < s.text.len - 1 {
+						s.pos++
+					} else {
+						s.error('unfinished string literal')
+					}
 					if s.text[s.pos] == s.quote {
 						s.is_inside_string = false
 						s.is_enclosed_inter = false