cgen: move sort fn after interface definitions(fix #24465) (#24967)

Author: Krchi

vlib/v/gen/c/cgen.v

@@ -634,9 +634,6 @@ pub fn gen(files []&ast.File, mut table ast.Table, pref_ &pref.Preferences) GenO
 		b.write_string2('\n// V result_xxx definitions:\n', g.out_results.str())
 	}
 	b.write_string2('\n// V definitions:\n', g.definitions.str())
-	if g.sort_fn_definitions.len > 0 {
-		b.write_string2('\n// V sort fn definitions:\n', g.sort_fn_definitions.str())
-	}
 	if !pref_.parallel_cc {
 		b.writeln('\n// V global/const non-precomputed definitions:')
 		for var_name in g.sorted_global_const_names {
@@ -651,6 +648,9 @@ pub fn gen(files []&ast.File, mut table ast.Table, pref_ &pref.Preferences) GenO
 	if interface_table.len > 0 {
 		b.write_string2('\n// V interface table:\n', interface_table)
 	}
+	if g.sort_fn_definitions.len > 0 {
+		b.write_string2('\n// V sort fn definitions:\n', g.sort_fn_definitions.str())
+	}
 	if g.hotcode_definitions.len > 0 {
 		b.write_string2('\n// V hotcode definitions:\n', g.hotcode_definitions.str())
 	}

vlib/v/tests/builtin_arrays/array_sort_with_interface_fn_call_test.v

@@ -0,0 +1,25 @@
+interface Person {
+	identify() int
+}
+
+struct Boy {}
+
+fn (self Boy) identify() int {
+	return 0
+}
+
+struct Girl {}
+
+fn (self Girl) identify() int {
+	return 1
+}
+
+fn test_main() {
+	mut ppl := []Person{}
+	ppl << &Girl{}
+	ppl << Boy{}
+	ppl[0].identify()
+	ppl.sort(a.identify() < b.identify())
+	assert ppl == [Person(Boy{}), Girl{}]
+	println(ppl)
+}