MDL-21198 fixed silly regression in type checking - grrr
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@@ -1009,7 +1009,7 @@ class core_renderer extends renderer_base {
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if (func_num_args() > 1) {
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debugging('html_form instance used as first parameter of $OUTPUT->single_button(), all other parameters are ignored.');
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}
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} else if ($url_or_singlebutton instanceof single_button or is_string($url_or_singlebutton)) {
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} else if ($url_or_singlebutton instanceof moodle_url or is_string($url_or_singlebutton)) {
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$button = new single_button($url_or_singlebutton, $label, $method, $options);
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} else {
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throw new coding_exception('The $$url_or_singlebutton param to $OUTPUT->single_button() must be either a URL (string/moodle_url) or a single_button instance.');
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