parser: fix silent parsing examples/vmod.v (#7264)

.github/workflows/ci.yml

@@ -611,3 +611,4 @@ jobs:
         ./v test-parser examples/fibonacci.v
         ./v test-parser examples/cli.v
         ./v test-parser examples/json.v
+        ./v test-parser examples/vmod.v

vlib/v/parser/parser.v

@@ -1140,7 +1140,7 @@ pub fn (mut p Parser) name_expr() ast.Expr {
 		p.check(.dot)
 		p.expr_mod = mod
 	}
-	lit0_is_capital := if p.tok.kind != .eof { p.tok.lit[0].is_capital() } else { false }
+	lit0_is_capital := if p.tok.kind != .eof && p.tok.lit.len > 0 { p.tok.lit[0].is_capital() } else { false }
 	// use heuristics to detect `func<T>()` from `var < expr`
 	is_generic_call := !lit0_is_capital && p.peek_tok.kind == .lt && (match p.peek_tok2.kind {
 		.name {

vlib/v/scanner/scanner.v

@@ -763,8 +763,11 @@ fn (mut s Scanner) text_scan() token.Token {
 				return s.new_token(.comma, '', 1)
 			}
 			`@` {
+				mut name := ''
+				if nextc != `\0` {
 					s.pos++
-				name := s.ident_name()
+					name = s.ident_name()
+				}
 				if s.is_fmt {
 					return s.new_token(.name, '@' + name, name.len + 1)
 				}