checker: fix map get anon fn value with mut argument (fix #14479) (#14493)

vlib/v/checker/fn.v

@@ -559,12 +559,12 @@ pub fn (mut c Checker) fn_call(mut node ast.CallExpr, mut continue_check &bool)
 	}
 	if !found && mut node.left is ast.IndexExpr {
 		c.expr(node.left)
-		sym := c.table.sym(node.left.left_type)
+		sym := c.table.final_sym(node.left.left_type)
 		if sym.info is ast.Array {
 			elem_sym := c.table.sym(sym.info.elem_type)
 			if elem_sym.info is ast.FnType {
-				node.return_type = elem_sym.info.func.return_type
-				return elem_sym.info.func.return_type
+				func = elem_sym.info.func
+				found = true
 			} else {
 				c.error('cannot call the element of the array, it is not a function',
 					node.pos)
@@ -572,23 +572,21 @@ pub fn (mut c Checker) fn_call(mut node ast.CallExpr, mut continue_check &bool)
 		} else if sym.info is ast.Map {
 			value_sym := c.table.sym(sym.info.value_type)
 			if value_sym.info is ast.FnType {
-				node.return_type = value_sym.info.func.return_type
-				return value_sym.info.func.return_type
+				func = value_sym.info.func
+				found = true
 			} else {
 				c.error('cannot call the value of the map, it is not a function', node.pos)
 			}
 		} else if sym.info is ast.ArrayFixed {
 			elem_sym := c.table.sym(sym.info.elem_type)
 			if elem_sym.info is ast.FnType {
-				node.return_type = elem_sym.info.func.return_type
-				return elem_sym.info.func.return_type
+				func = elem_sym.info.func
+				found = true
 			} else {
 				c.error('cannot call the element of the array, it is not a function',
 					node.pos)
 			}
 		}
-		found = true
-		return ast.string_type
 	}
 	if !found && mut node.left is ast.CallExpr {
 		c.expr(node.left)

vlib/v/checker/tests/fn_type_mismatch.out

@@ -5,3 +5,16 @@ vlib/v/checker/tests/fn_type_mismatch.vv:11:15: error: invalid array element: ex
       |                  ~~~
    12 |     println(fns[0](10.0, 5.0))
    13 |     println(fns[1](10.0, 5.0))
+vlib/v/checker/tests/fn_type_mismatch.vv:12:17: error: cannot use `float literal` as `int` in argument 1 to ``
+   10 | fn main() {
+   11 |     fns := [add, div]
+   12 |     println(fns[0](10.0, 5.0))
+      |                    ~~~~
+   13 |     println(fns[1](10.0, 5.0))
+   14 | }
+vlib/v/checker/tests/fn_type_mismatch.vv:13:17: error: cannot use `float literal` as `int` in argument 1 to ``
+   11 |     fns := [add, div]
+   12 |     println(fns[0](10.0, 5.0))
+   13 |     println(fns[1](10.0, 5.0))
+      |                    ~~~~
+   14 | }

vlib/v/tests/map_get_anon_fn_value_with_mut_arg_test.v

@@ -0,0 +1,15 @@
+struct Bar {}
+
+fn test_map_get_anon_fn_value_with_mut_arg() {
+	foo := {
+		0: fn (mut bar Bar) int {
+			return 22
+		}
+	}
+
+	mut bar := Bar{}
+	ret := foo[0](mut bar)
+
+	println(ret)
+	assert ret == 22
+}