vfmt: fix same line stmt comments

vlib/v/ast/ast.v

@@ -677,6 +677,7 @@ pub:
 	is_multi bool
 	line_nr int
 	pos token.Position
+	same_line bool
 }
 
 pub struct ConcatExpr {

vlib/v/fmt/fmt.v

@@ -681,7 +681,13 @@ fn (f mut Fmt) or_expr(or_block ast.OrExpr) {
 
 fn (f mut Fmt) comment(node ast.Comment) {
 	if !node.text.contains('\n') {
-		f.writeln('// $node.text')// $node.pos.line_nr')
+		is_separate_line := node.text.starts_with('|')
+		if is_separate_line {
+			f.writeln('// ${node.text[1..]}')// $node.pos.line_nr')
+		} else {
+			f.out.go_back(1)
+			f.writeln('// $node.text')
+		}
 		return
 	}
 	lines := node.text.split_into_lines()

vlib/v/gen/cgen.v

@@ -11,8 +11,8 @@ import (
 	v.util
 )
 
+// Full list of C reserved words, from: https://en.cppreference.com/w/c/keyword
 const (
-	// Full list of C reserved words, from: https://en.cppreference.com/w/c/keyword
 	c_reserved = ['delete', 'exit', 'unix',
 	'error', 'calloc', 'malloc', 'free', 'panic',
 	'auto', 'char', 'default', 'do', 'double', 'extern', 'float', 'inline', 'int', 'long', 'register',
@@ -59,9 +59,6 @@ const (
 	'\t\t\t\t\t\t\t\t']
 )
 
-fn foo(file []ast.File) {}
-fn foo2(file []int) {}
-
 pub fn cgen(files []ast.File, table &table.Table, pref &pref.Preferences) string {
 	// println('start cgen2')
 	mut g := Gen{
@@ -228,6 +225,7 @@ pub fn (g mut Gen) write_typedef_types() {
 					g.definitions.writeln(');')
 				}
 			}
+			//
 			else {
 				continue
 			}

vlib/v/scanner/scanner.v

@@ -732,17 +732,21 @@ pub fn (s mut Scanner) scan() token.Token {
 				start := s.pos + 1
 				s.ignore_line()
 				s.line_comment = s.text[start + 1..s.pos]
-				// if s.comments_mode == .parse_comments {
-				// println('line c $s.line_comment')
-				// }
 				comment := s.line_comment.trim_space()
-				// s.line_comment = comment
 				if s.comments_mode == .parse_comments {
-					// println('line c "$comment" z=')
+					// Find out if this comment is on its own line (for vfmt)
+					mut is_separate_line_comment := true
+					for j := start-2; s.text[j] != `\n`; j-- {
+						if !(s.text[j] in [`\t`, ` `]) {
+							is_separate_line_comment = false
+						}
+					}
+					if is_separate_line_comment {
+						comment = '|' + comment
+					}
+					s.pos--
 					// fix line_nr, \n was read, and the comment is marked
 					// on the next line
-					s.pos--
-					// println("'" + s.text[s.pos].str() + "'")
 					s.line_nr--
 					return s.new_token(.comment, comment)
 				}