From b1357d9641998ac7fcdbb3e3fd4a3b3b5a4aad21 Mon Sep 17 00:00:00 2001
From: Alexander Medvednikov <alexander@medvednikov.com>
Date: Thu, 27 Feb 2020 16:51:39 +0100
Subject: [PATCH] v2: checker: fix filter()

---
 cmd/v/simple_tool.v      |  1 +
 vlib/v/checker/checker.v | 38 +++++++++++++++++++++-----------------
 2 files changed, 22 insertions(+), 17 deletions(-)

diff --git a/cmd/v/simple_tool.v b/cmd/v/simple_tool.v
index e69e463d7a..f595554746 100644
--- a/cmd/v/simple_tool.v
+++ b/cmd/v/simple_tool.v
@@ -20,6 +20,7 @@ fn launch_tool(is_verbose bool, tname string, cmdname string) {
 		tname_index = os.args.len
 	}
 	mut compilation_options := os.args[1..tname_index].clone()
+	//f  := os.args.join(' ')
 	tool_args := os.args[1..].join(' ')
 	tool_exe := path_of_executable(os.realpath('$vroot/cmd/tools/$tname'))
 	tool_source := os.realpath('$vroot/cmd/tools/${tname}.v')
diff --git a/vlib/v/checker/checker.v b/vlib/v/checker/checker.v
index 771fc8342e..bdf60f3959 100644
--- a/vlib/v/checker/checker.v
+++ b/vlib/v/checker/checker.v
@@ -222,6 +222,10 @@ pub fn (c mut Checker) check_method_call_expr(method_call_expr ast.MethodCallExp
 			return method.return_type
 		}
 	}
+	if typ_sym.kind == .array && method_call_expr.name == 'filter' {
+		// info := typ_sym.info as table.Array
+		return typ // info.elem_type
+	}
 	c.error('type `$typ_sym.name` has no method `$method_call_expr.name`', method_call_expr.pos)
 	return table.void_type
 }
@@ -284,25 +288,25 @@ pub fn (c mut Checker) return_stmt(return_stmt ast.Return) {
 }
 
 pub fn (c mut Checker) assign_stmt(assign_stmt ast.AssignStmt) {
-    // multi return
-    if assign_stmt.left.len > assign_stmt.right.len {
-        right := c.expr(assign_stmt.right[0])
-        right_sym := c.table.get_type_symbol(right)
-        info := right_sym.mr_info()
-        if right_sym.kind != .multi_return {
-            c.error('wrong number of vars', assign_stmt.pos)
-        }
-        mut scope := c.file.scope.innermost(assign_stmt.pos.pos) or {
-            c.file.scope
-        }
-        for i, ident in assign_stmt.left {
+	// multi return
+	if assign_stmt.left.len > assign_stmt.right.len {
+		right := c.expr(assign_stmt.right[0])
+		right_sym := c.table.get_type_symbol(right)
+		info := right_sym.mr_info()
+		if right_sym.kind != .multi_return {
+			c.error('wrong number of vars', assign_stmt.pos)
+		}
+		mut scope := c.file.scope.innermost(assign_stmt.pos.pos) or {
+			c.file.scope
+		}
+		for i, ident in assign_stmt.left {
 			// TODO: check types
 			scope.override_var(ast.VarDecl{
-                name: ident.name
-                typ: info.types[i]
-            })
-        }
-    }
+				name: ident.name
+				typ: info.types[i]
+			})
+		}
+	}
 	// TODO: multiple assign
 }