From 2d381d69ea92500fdbf8583c4eb8662110e13c2f Mon Sep 17 00:00:00 2001
From: yuyi <yuyi98@163.com>
Date: Mon, 25 Apr 2022 19:42:43 +0800
Subject: [PATCH] checker: fix error for match aliases (#14157)

---
 vlib/v/checker/match.v            | 5 +++--
 vlib/v/tests/match_aliases_test.v | 9 +++++++++
 2 files changed, 12 insertions(+), 2 deletions(-)
 create mode 100644 vlib/v/tests/match_aliases_test.v

diff --git a/vlib/v/checker/match.v b/vlib/v/checker/match.v
index da305a00fc..916b903079 100644
--- a/vlib/v/checker/match.v
+++ b/vlib/v/checker/match.v
@@ -162,9 +162,10 @@ fn (mut c Checker) match_exprs(mut node ast.MatchExpr, cond_type_sym ast.TypeSym
 				c.expected_type = node.expected_type
 				low_expr := expr.low
 				high_expr := expr.high
+				final_cond_sym := c.table.final_sym(node.cond_type)
 				if low_expr is ast.IntegerLiteral {
 					if high_expr is ast.IntegerLiteral
-						&& (cond_type_sym.is_int() || cond_type_sym.info is ast.Enum) {
+						&& (final_cond_sym.is_int() || final_cond_sym.info is ast.Enum) {
 						low = low_expr.val.i64()
 						high = high_expr.val.i64()
 						if low > high {
@@ -174,7 +175,7 @@ fn (mut c Checker) match_exprs(mut node ast.MatchExpr, cond_type_sym ast.TypeSym
 						c.error('mismatched range types', low_expr.pos)
 					}
 				} else if low_expr is ast.CharLiteral {
-					if high_expr is ast.CharLiteral && cond_type_sym.kind in [.u8, .char, .rune] {
+					if high_expr is ast.CharLiteral && final_cond_sym.kind in [.u8, .char, .rune] {
 						low = low_expr.val[0]
 						high = high_expr.val[0]
 						if low > high {
diff --git a/vlib/v/tests/match_aliases_test.v b/vlib/v/tests/match_aliases_test.v
new file mode 100644
index 0000000000..88b4a39590
--- /dev/null
+++ b/vlib/v/tests/match_aliases_test.v
@@ -0,0 +1,9 @@
+fn test_match_aliases() {
+	a := byte(97)
+	ret := match a {
+		`0`...`9`, `a`...`f` { 'OK' }
+		else { 'NOT OK' }
+	}
+	println(ret)
+	assert ret == 'OK'
+}