v2: update MatchExpr in vfmt

vlib/v/fmt/fmt.v

@@ -434,21 +434,30 @@ fn (f mut Fmt) expr(node ast.Expr) {
 			f.expr(it.cond)
 			f.writeln(' {')
 			f.indent++
-			for i, expr in it.match_exprs {
+			for i, branch in it.branches {
+				// normal branch
+				if i < it.branches.len - 1 {
+					for j,expr in branch.exprs {
 						f.expr(expr)
+						if j < branch.exprs.len - 1 {
+							f.write(', ')
+						}
+					}
 					f.writeln(' {')
-				f.stmts(it.blocks[i].stmts)
+					f.stmts(branch.stmts)
 					f.writeln('}')
 				}
-
-			else_stmts := it.blocks[it.blocks.len - 1].stmts
-			if (else_stmts.len == 0) {
+				// else branch
+				else {
+					if (branch.stmts.len == 0) {
 						f.writeln('else {}')
 					} else {
 						f.writeln('else {')
-				f.stmts(else_stmts)
+						f.stmts(branch.stmts)
 						f.writeln('}')
 					}
+				}
+			}
 			f.indent--
 			f.write('}')
 		}