From 0c183da116d6265774a5e177068b3010882b2222 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20D=C3=A4schle?= <daniel.daeschle@gmail.com>
Date: Thu, 20 Aug 2020 16:29:40 +0200
Subject: [PATCH] checker: fix sort return type (#6182)

---
 vlib/v/checker/checker.v |  2 ++
 vlib/v/gen/cgen.v        | 10 +++++-----
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/vlib/v/checker/checker.v b/vlib/v/checker/checker.v
index 473513cb80..323f6edd2c 100644
--- a/vlib/v/checker/checker.v
+++ b/vlib/v/checker/checker.v
@@ -910,6 +910,8 @@ pub fn (mut c Checker) call_method(mut call_expr ast.CallExpr) table.Type {
 			// in ['clone', 'str'] {
 			call_expr.receiver_type = left_type.to_ptr()
 			// call_expr.return_type = call_expr.receiver_type
+		} else if method_name == 'sort' {
+			call_expr.return_type = table.void_type
 		}
 		return call_expr.return_type
 	} else if left_type_sym.kind == .map && method_name == 'clone' {
diff --git a/vlib/v/gen/cgen.v b/vlib/v/gen/cgen.v
index 647b35b16d..71ea236d5c 100644
--- a/vlib/v/gen/cgen.v
+++ b/vlib/v/gen/cgen.v
@@ -3907,14 +3907,14 @@ fn (mut g Gen) gen_array_map(node ast.CallExpr) {
 // `users.sort(a.age < b.age)`
 fn (mut g Gen) gen_array_sort(node ast.CallExpr) {
 	// println('filter s="$s"')
-	return_sym := g.table.get_type_symbol(node.return_type)
-	if return_sym.kind != .array {
+	rec_sym := g.table.get_type_symbol(node.receiver_type)
+	if rec_sym.kind != .array {
 		println(node.name)
 		println(g.typ(node.receiver_type))
-		// println(sym.kind)
-		verror('sort() requires an array')
+		// println(rec_sym.kind)
+		verror('.sort() is an array method')
 	}
-	info := return_sym.info as table.Array
+	info := rec_sym.info as table.Array
 	// No arguments means we are sorting an array of builtins (e.g. `numbers.sort()`)
 	// The type for the comparison fns is the type of the element itself.
 	mut typ := info.elem_type