cgen: fix array.map with closure var fn (#22002)

Author: felipensp

vlib/v/gen/c/array.v

@@ -553,11 +553,17 @@ fn (mut g Gen) gen_array_map(node ast.CallExpr) {
 		ast.Ident {
 			g.write('${ret_elem_type} ${tmp_map_expr_result_name} = ')
 			if expr.kind == .function {
+				if expr.obj is ast.Var && expr.obj.is_inherited {
+					g.write(closure_ctx + '->')
+				}
 				g.write('${c_name(expr.name)}(${var_name})')
 			} else if expr.kind == .variable {
 				var_info := expr.var_info()
 				sym := g.table.sym(var_info.typ)
 				if sym.kind == .function {
+					if expr.obj is ast.Var && expr.obj.is_inherited {
+						g.write(closure_ctx + '->')
+					}
 					g.write('${c_name(expr.name)}(${var_name})')
 				} else {
 					g.expr(expr)

vlib/v/tests/closure_fn_arg_in_map_test.v

@@ -0,0 +1,19 @@
+struct Options {
+}
+
+fn sort_dictionary_order(mut lines []string, options Options) {
+	map_fn := fn (e u8) u8 {
+		return if e.is_digit() || e.is_letter() || e == ` ` { e } else { ` ` }
+	}
+	lines.sort_with_compare(fn [map_fn] (a &string, b &string) int {
+		aa := a.bytes().map(map_fn).bytestr()
+		bb := b.bytes().map(map_fn).bytestr()
+		return compare_strings(aa, bb)
+	})
+}
+
+fn test_main() {
+	mut a := ['a', 'b', 'c'].reverse()
+	sort_dictionary_order(mut a, Options{})
+	assert dump(a) == ['a', 'b', 'c']
+}