vfmt: handle comments after last const field

vlib/v/ast/ast.v

@@ -162,6 +162,7 @@ pub:
 	pos    token.Position
 pub mut:
 	fields []ConstField
+	end_comments []Comment
 }
 
 pub struct StructDecl {

vlib/v/fmt/fmt.v

@@ -677,8 +677,13 @@ pub fn (mut f Fmt) struct_decl(node ast.StructDecl) {
 		}
 		f.write('\n')
 	}
+	f.comments_after_last_field(node.end_comments)
+	f.writeln('}\n')
+}
+
+pub fn (mut f Fmt) comments_after_last_field(comments []ast.Comment) {
 	// Handle comments after last field
-	for comment in node.end_comments {
+	for comment in comments {
 		f.indent++
 		f.empty_line = true
 		f.comment(comment, {
@@ -687,7 +692,6 @@ pub fn (mut f Fmt) struct_decl(node ast.StructDecl) {
 		f.writeln('')
 		f.indent--
 	}
-	f.writeln('}\n')
 }
 
 pub fn (mut f Fmt) interface_decl(node ast.InterfaceDecl) {
@@ -1814,6 +1818,7 @@ pub fn (mut f Fmt) const_decl(it ast.ConstDecl) {
 		f.expr(field.expr)
 		f.writeln('')
 	}
+	f.comments_after_last_field(it.end_comments)
 	f.indent--
 	f.writeln(')\n')
 }

vlib/v/fmt/tests/consts_with_comments_keep.vv

@@ -0,0 +1,4 @@
+const (
+	fsm_state_array = ['init', 'state_a', 'state_b', 'state_c', 'exit'] // use as a first half key for map see fsm_state_ev_fn, the same order as in enum FSM_state
+	fsm_event_array = ['ev1', 'ev2', 'ev3', 'ev4', 'ev5'] // use as a second half key for map see fsm_state_ev_fn, the same order as in enum FSM_event
+)

vlib/v/parser/parser.v

@@ -1602,14 +1602,12 @@ fn (mut p Parser) const_decl() ast.ConstDecl {
 	}
 	p.next() // (
 	mut fields := []ast.ConstField{}
-	for p.tok.kind != .rpar {
 	mut comments := []ast.Comment{}
-		for p.tok.kind == .comment {
+	for {
-			comments << p.comment()
+		comments = p.eat_comments()
 		if p.tok.kind == .rpar {
 			break
 		}
-		}
 		pos := p.tok.position()
 		name := p.check_name()
 		if util.contains_capital(name) {
@@ -1630,6 +1628,7 @@ fn (mut p Parser) const_decl() ast.ConstDecl {
 		}
 		fields << field
 		p.global_scope.register(field.name, field)
+		comments = []
 	}
 	p.top_level_statement_end()
 	p.check(.rpar)
@@ -1637,6 +1636,7 @@ fn (mut p Parser) const_decl() ast.ConstDecl {
 		pos: start_pos.extend(end_pos)
 		fields: fields
 		is_pub: is_pub
+		end_comments: comments
 	}
 }