parser: fix parsing of cgen.v, in normal mode, when the table is empt…

…y (no files in `builtin` are preparsed) (fix #20606) (#20611)

vlib/v/parser/parser.v

@@ -2218,7 +2218,7 @@ fn (mut p Parser) parse_multi_expr(is_top_level bool) ast.Stmt {
 	} else if !p.pref.translated && !p.is_translated && !p.pref.is_fmt && !p.pref.is_vet
 		&& tok.kind !in [.key_if, .key_match, .key_lock, .key_rlock, .key_select] {
 		for node in left {
-			if (is_top_level || p.tok.kind != .rcbr)
+			if (is_top_level || p.tok.kind !in [.comment, .rcbr])
 				&& node !in [ast.CallExpr, ast.PostfixExpr, ast.ComptimeCall, ast.SelectorExpr, ast.DumpExpr] {
 				is_complex_infix_expr := node is ast.InfixExpr
 					&& node.op in [.left_shift, .right_shift, .unsigned_right_shift, .arrow]

vlib/v/parser/v_parser_test.v

@@ -6,6 +6,7 @@ import v.gen.c
 import v.checker
 import v.pref
 import term
+import os
 
 fn test_eval() {
 	/*
@@ -264,6 +265,42 @@ fn test_fn_is_html_open_tag() {
 	assert b == false
 }
 
+fn scan_v(mut files []string, path string) ! {
+	for i in os.ls(path)! {
+		p := os.join_path(path, i)
+		if os.is_file(p) {
+			if i.ends_with('.v') && !i.contains_any_substr(['_test.', 'test_', 'tests_']) {
+				files << p
+			}
+		} else {
+			if !i.starts_with('test') && !i.ends_with('_tests') && !i.ends_with('builtin') {
+				scan_v(mut files, p)!
+			}
+		}
+	}
+}
+
+fn parse(output_mode pref.OutputMode) ! {
+	mut pref_ := pref.new_preferences()
+	pref_.output_mode = output_mode
+	mut files := []string{}
+	scan_v(mut files, pref_.vlib)!
+	scan_v(mut files, os.join_path(pref_.vroot, 'cmd'))!
+	for f in files {
+		table := ast.new_table()
+		p := parse_file(f, table, .parse_comments, pref_)
+		assert isnil(p) == false
+	}
+}
+
+fn test_parse_with_silent() {
+	parse(.silent)!
+}
+
+fn test_parse_with_stdout() {
+	parse(.stdout)!
+}
+
 // For issue #15516
 fn test_anon_struct() {
 }