checker: comptime match only eval true branch

vlib/v/checker/match.v

@@ -221,6 +221,8 @@ fn (mut c Checker) match_expr(mut node ast.MatchExpr) ast.Type {
 				}
 			}
 		}
+
+		if !node.is_comptime || (node.is_comptime && comptime_match_branch_result) {
 			if node.is_expr {
 				c.stmts_ending_with_expression(mut branch.stmts, c.expected_or_type)
 			} else {
@@ -409,6 +411,7 @@ fn (mut c Checker) match_expr(mut node ast.MatchExpr) ast.Type {
 					}
 				}
 			}
+		}
 		first_iteration = false
 		if has_return := c.has_return(branch.stmts) {
 			if has_return {

vlib/v/tests/comptime/comptime_match_eval_only_true_branch_test.v

@@ -0,0 +1,17 @@
+module main
+
+fn func[T]() bool {
+	$match T {
+		u8, u16 {
+			return true
+		}
+		$else {
+			// return false
+			$compile_error('fail')
+		}
+	}
+}
+
+fn test_comptime_match_eval_only_true_branch() {
+	assert func[u8]()
+}