1382710 - stylo: panicked at 'called `Option::unwrap()` on a `None` value'

Status: RESOLVED DUPLICATE of bug 1381233

(Core :: CSS Parsing and Computation, defect)

Description

[Jesse Schwartzentruber (:truber)]

Attachment: testcase.html

The attached testcase causes a panic in m-c rev 68046a58f829

thread 'StyleThread#1' panicked at 'called `Option::unwrap()` on a `None` value', /checkout/src/libcore/option.rs:329
stack backtrace:
   0: std::sys::imp::backtrace::tracing::imp::unwind_backtrace
   1: std::sys_common::backtrace::_print
   2: std::panicking::default_hook::{{closure}}
   3: std::panicking::default_hook
   4: std::panicking::rust_panic_with_hook
   5: std::panicking::begin_panic
   6: std::panicking::begin_panic_fmt
   7: rust_begin_unwind
   8: core::panicking::panic_fmt
   9: core::panicking::panic
  10: <core::option::Option<T>>::unwrap
  11: <style::values::specified::color::Color as style::values::computed::ToComputedValue>::to_computed_value
  12: <style::properties::longhands::color::SpecifiedValue as style::values::computed::ToComputedValue>::to_computed_value
  13: style::properties::longhands::color::cascade_property
  14: style::properties::apply_declarations
  15: style::properties::cascade
  16: <style::style_resolver::StyleResolverForElement<'a, 'ctx, 'le, E>>::cascade_style
  17: <style::style_resolver::StyleResolverForElement<'a, 'ctx, 'le, E>>::resolve_primary_style
  18: <style::style_resolver::StyleResolverForElement<'a, 'ctx, 'le, E>>::resolve_style
  19: <style::style_resolver::StyleResolverForElement<'a, 'ctx, 'le, E>>::resolve_style_with_default_parents::{{closure}}
  20: style::style_resolver::with_default_parent_styles
  21: <style::style_resolver::StyleResolverForElement<'a, 'ctx, 'le, E>>::resolve_style_with_default_parents
  22: style::traversal::compute_style
  23: style::traversal::recalc_style_at
  24: <style::gecko::traversal::RecalcStyleOnly<'recalc> as style::traversal::DomTraversal<style::gecko::wrapper::GeckoElement<'le>>>::process_preorder
  25: style::parallel::traverse_nodes
  26: style::parallel::traverse_nodes
  27: style::parallel::traverse_dom::{{closure}}::{{closure}}
  28: rayon_core::scope::Scope::execute_job_closure::{{closure}}
  29: <std::panic::AssertUnwindSafe<F> as core::ops::FnOnce<()>>::call_once
  30: std::panicking::try::do_call
  31: <unknown>
Redirecting call to abort() to mozalloc_abort

Comment 1

[Emilio Cobos Álvarez (:emilio)]

Nice testcase! (You're making finding out bugs much easier, thanks!)

This should be bug 1381233, which is about to land.