error[E0275]: overflow evaluating the requirement

[dxvid-pts]

Both crates pass cargo check and are valid when used individually or combined with other crates. However, as soon as I add stylo together with sea-orm, I encounter unusual compiler errors. I've already tried using the next-generation trait solver, but this did not resolve the issue.

I tried this:

[dependencies]
stylo = { version = "0.8.0" }
sea-orm = { version = "1.1.17", default-features = false }

I expected to see this happen: Finished dev profile [unoptimized + debuginfo] target(s) in 11.42s

Instead, this happened: Multiple error[E0275] overflow errors like

error[E0275]: overflow evaluating the requirement `GenericCalcNode<Leaf>: std::fmt::Debug`
  --> /Users/xxx/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/stylo-0.8.0/color/component.rs:25:17
   |
25 | #[derive(Clone, Debug, MallocSizeOf, PartialEq, ToShmem)]
   |                 ^^^^^
   |
   = note: required for `std::boxed::Box<GenericCalcNode<Leaf>>` to implement `std::fmt::Debug`
   = note: 1 redundant requirement hidden
   = note: required for `&std::boxed::Box<GenericCalcNode<Leaf>>` to implement `std::fmt::Debug`
   = note: required for the cast from `&&std::boxed::Box<GenericCalcNode<Leaf>>` to `&dyn std::fmt::Debug`
   = note: this error originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0275]: overflow evaluating the requirement `GenericTransformOperation<computed::angle::Angle, f32, CSSPixelLength, i32, length_percentage::LengthPercentage>: std::fmt::Debug`
  --> /Users/xxx/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/stylo-0.8.0/custom_properties_map.rs:40:10
   |
40 | #[derive(Debug, Clone)]
   |          ^^^^^
   |
   = note: required for `OwnedSlice<GenericTransformOperation<Angle, f32, CSSPixelLength, i32, ...>>` to implement `std::fmt::Debug`
   = note: 7 redundant requirements hidden
   = note: required for `&IndexMap<Atom<AtomStaticSet>, Option<Value<...>>, ...>` to implement `std::fmt::Debug`
   = note: required for the cast from `&&IndexMap<Atom<AtomStaticSet>, Option<Value<...>>, ...>` to `&dyn std::fmt::Debug`
   = note: the full name for the type has been written to '/Users/xxx/Code/Experiments/rs_bug_check/target/debug/deps/style-8edfbe4a6e4dd12f.long-type-13530743951296697762.txt'
   = note: consider using `--verbose` to print the full type name to the console
   = note: this error originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0275]: overflow evaluating the requirement `GenericTransformOperation<computed::angle::Angle, f32, CSSPixelLength, i32, length_percentage::LengthPercentage>: std::fmt::Debug`
   --> /Users/xxx/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/stylo-0.8.0/properties_and_values/value.rs:581:17
    |
581 | #[derive(Clone, Debug, MallocSizeOf, PartialEq)]
    |                 ^^^^^
    |
    = note: required for `OwnedSlice<GenericTransformOperation<Angle, f32, CSSPixelLength, i32, ...>>` to implement `std::fmt::Debug`
    = note: 5 redundant requirements hidden
    = note: required for `&Value<...>` to implement `std::fmt::Debug`
    = note: required for the cast from `&&Value<...>` to `&dyn std::fmt::Debug`
    = note: the full name for the type has been written to '/Users/xxx/Code/Experiments/rs_bug_check/target/debug/deps/style-8edfbe4a6e4dd12f.long-type-13530743951296697762.txt'
    = note: consider using `--verbose` to print the full type name to the console
    = note: this error originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0275]: overflow evaluating the requirement `std::boxed::Box<GenericCalcNode<CalcLengthPercentageLeaf>>: std::fmt::Debug`
   --> /Users/xxx/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/stylo-0.8.0/values/computed/length_percentage.rs:907:12
    |
907 |     Clone, Debug, Deserialize, MallocSizeOf, Serialize, ToAnimatedZero, ToResolvedValue, ToCss,
    |            ^^^^^
    |
note: required for `GenericCalcNode<CalcLengthPercentageLeaf>` to implement `std::fmt::Debug`
   --> /Users/xxx/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/stylo-0.8.0/values/generics/calc.rs:187:5
    |
187 |     Debug,
    |     ^^^^^ unsatisfied trait bound introduced in this `derive` macro
...
196 | pub enum GenericCalcNode<L> {
    |          ^^^^^^^^^^^^^^^^^^
    = note: 1 redundant requirement hidden
    = note: required for `&GenericCalcNode<CalcLengthPercentageLeaf>` to implement `std::fmt::Debug`
    = note: required for the cast from `&&GenericCalcNode<CalcLengthPercentageLeaf>` to `&dyn std::fmt::Debug`
    = note: this error originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0275]: overflow evaluating the requirement `std::boxed::Box<GenericCalcNode<Leaf>>: std::fmt::Debug`
   --> /Users/xxx/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/stylo-0.8.0/values/specified/calc.rs:129:17
    |
129 | #[derive(Clone, Debug, MallocSizeOf, PartialEq, ToCss, ToShmem)]
    |                 ^^^^^
    |
note: required for `GenericCalcNode<Leaf>` to implement `std::fmt::Debug`
   --> /Users/xxx/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/stylo-0.8.0/values/generics/calc.rs:187:5
    |
187 |     Debug,
    |     ^^^^^ unsatisfied trait bound introduced in this `derive` macro
...
196 | pub enum GenericCalcNode<L> {
    |          ^^^^^^^^^^^^^^^^^^
    = note: 1 redundant requirement hidden
    = note: required for `&GenericCalcNode<Leaf>` to implement `std::fmt::Debug`
    = note: required for the cast from `&&GenericCalcNode<Leaf>` to `&dyn std::fmt::Debug`
    = note: this error originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0275]: overflow evaluating the requirement `GenericColorMix<GenericColor<computed::percentage::Percentage>, computed::percentage::Percentage>: std::fmt::Debug`
     --> /Users/xxx/Code/Experiments/rs_bug_check/target/debug/build/stylo-e8af7d86571b5602/out/properties.rs:15137:29
      |
15137 |             #[derive(Clone, Debug, MallocSizeOf, PartialEq, ToCss, ToTyped)]
      |                             ^^^^^
      |
      = note: required for `Box<GenericColorMix<GenericColor<Percentage>, Percentage>>` to implement `std::fmt::Debug`
      = note: 4 redundant requirements hidden
      = note: required for `&ArcSlice<GenericSimpleShadow<GenericColor<Percentage>, CSSPixelLength, ...>>` to implement `std::fmt::Debug`
      = note: required for the cast from `&&ArcSlice<GenericSimpleShadow<GenericColor<Percentage>, CSSPixelLength, ...>>` to `&dyn std::fmt::Debug`
      = note: the full name for the type has been written to '/Users/xxx/Code/Experiments/rs_bug_check/target/debug/deps/style-8edfbe4a6e4dd12f.long-type-10743478807678153051.txt'
      = note: consider using `--verbose` to print the full type name to the console
      = note: this error originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
...

Meta

rustc --version --verbose:

rustc --version --verbose
rustc 1.90.0 (1159e78c4 2025-09-14)
binary: rustc
commit-hash: 1159e78c4747b02ef996e55082b704c09b970588
commit-date: 2025-09-14
host: aarch64-apple-darwin
release: 1.90.0
LLVM version: 20.1.8

Backtrace

RUST_BACKTRACE=1 cargo build
   Compiling stable_deref_trait v1.2.1
   Compiling siphasher v1.0.1
   Compiling smallvec v1.15.1
   Compiling writeable v0.6.2
   Compiling litemap v0.8.1
   Compiling serde_core v1.0.228
   Compiling libc v0.2.177
   Compiling cfg-if v1.0.4
   Compiling scopeguard v1.2.0
   Compiling num-traits v0.2.19
   Compiling zerofrom v0.1.6
   Compiling new_debug_unreachable v1.0.6
   Compiling precomputed-hash v0.1.1
   Compiling dtoa v1.0.10
   Compiling lock_api v0.4.14
   Compiling yoke v0.8.1
   Compiling icu_properties_data v2.1.1
   Compiling icu_normalizer_data v2.1.1
   Compiling phf_shared v0.11.3
   Compiling dtoa-short v0.3.5
   Compiling log v0.4.28
   Compiling itoa v1.0.15
   Compiling derive_more v2.0.1
   Compiling smallbitvec v2.6.0
   Compiling utf8_iter v1.0.4
   Compiling thin-vec v0.2.14
   Compiling phf_generator v0.11.3
   Compiling zerovec v0.11.5
   Compiling zerotrie v0.2.3
   Compiling crossbeam-utils v0.8.21
   Compiling rustc-hash v2.1.1
   Compiling percent-encoding v2.3.2
   Compiling bitflags v2.10.0
   Compiling phf_codegen v0.11.3
   Compiling string_cache_codegen v0.5.4
   Compiling phf_macros v0.11.3
   Compiling form_urlencoded v1.2.2
   Compiling pin-project-lite v0.2.16
   Compiling parking_lot_core v0.9.12
   Compiling selectors v0.32.0
   Compiling void v1.0.2
   Compiling icu_locale_data v2.1.1
   Compiling crossbeam-epoch v0.9.18
   Compiling libm v0.2.15
   Compiling futures-core v0.3.31
   Compiling parking_lot v0.12.5
   Compiling static_assertions v1.1.0
   Compiling either v1.15.0
   Compiling lazy_static v1.5.0
   Compiling ordered-float v4.6.0
   Compiling stylo_atoms v0.8.0
   Compiling crossbeam-deque v0.8.6
   Compiling web_atoms v0.1.3
   Compiling stylo v0.8.0
   Compiling rayon-core v1.13.0
   Compiling icu_segmenter_data v2.1.1
   Compiling aliasable v0.1.3
   Compiling phf v0.11.3
   Compiling pin-utils v0.1.0
   Compiling futures-task v0.3.31
   Compiling slab v0.4.11
   Compiling tinystr v0.8.2
   Compiling potential_utf v0.1.4
   Compiling hashbrown v0.16.0
   Compiling arrayvec v0.7.6
   Compiling equivalent v1.0.2
   Compiling icu_locale_core v2.1.1
   Compiling icu_collections v2.1.1
   Compiling tracing-core v0.1.34
   Compiling uluru v3.1.0
   Compiling core_maths v0.1.1
   Compiling rayon v1.11.0
   Compiling indexmap v2.12.0
   Compiling tracing v0.1.41
   Compiling futures-util v0.3.31
   Compiling ouroboros v0.18.5
   Compiling serde v1.0.228
   Compiling sea-query v0.32.7
   Compiling async-stream v0.3.6
   Compiling icu_provider v2.1.1
   Compiling thiserror v2.0.17
   Compiling itertools v0.14.0
   Compiling num-integer v0.1.46
   Compiling string_cache v0.8.9
   Compiling icu_properties v2.1.1
   Compiling icu_normalizer v2.1.1
   Compiling servo_arc v0.4.1
   Compiling euclid v0.22.11
   Compiling app_units v0.7.8
   Compiling icu_locale v2.1.1
   Compiling cssparser v0.35.0
   Compiling num_cpus v1.17.0
   Compiling encoding_rs v0.8.35
   Compiling mime v0.3.17
   Compiling stylo_config v0.8.0
   Compiling matches v0.1.10
   Compiling idna_adapter v1.2.1
   Compiling atomic_refcell v0.1.13
   Compiling strum v0.26.3
   Compiling idna v1.1.0
   Compiling icu_segmenter v2.1.1
   Compiling stylo_static_prefs v0.8.0
   Compiling byteorder v1.5.0
   Compiling to_shmem v0.2.0
   Compiling url v2.5.7
   Compiling sea-orm v1.1.17
   Compiling stylo_malloc_size_of v0.8.0
   Compiling stylo_dom v0.8.0
   Compiling stylo_traits v0.8.0
error[E0275]: overflow evaluating the requirement `GenericCalcNode<Leaf>: std::fmt::Debug`
  --> /Users/xxx/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/stylo-0.8.0/color/component.rs:25:17
   |
25 | #[derive(Clone, Debug, MallocSizeOf, PartialEq, ToShmem)]
   |                 ^^^^^
   |
   = note: required for `std::boxed::Box<GenericCalcNode<Leaf>>` to implement `std::fmt::Debug`
   = note: 1 redundant requirement hidden
   = note: required for `&std::boxed::Box<GenericCalcNode<Leaf>>` to implement `std::fmt::Debug`
   = note: required for the cast from `&&std::boxed::Box<GenericCalcNode<Leaf>>` to `&dyn std::fmt::Debug`
   = note: this error originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0275]: overflow evaluating the requirement `GenericTransformOperation<computed::angle::Angle, f32, CSSPixelLength, i32, length_percentage::LengthPercentage>: std::fmt::Debug`
  --> /Users/xxx/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/stylo-0.8.0/custom_properties_map.rs:40:10
   |
40 | #[derive(Debug, Clone)]
   |          ^^^^^
   |
   = note: required for `OwnedSlice<GenericTransformOperation<Angle, f32, CSSPixelLength, i32, ...>>` to implement `std::fmt::Debug`
   = note: 7 redundant requirements hidden
   = note: required for `&IndexMap<Atom<AtomStaticSet>, Option<Value<...>>, ...>` to implement `std::fmt::Debug`
   = note: required for the cast from `&&IndexMap<Atom<AtomStaticSet>, Option<Value<...>>, ...>` to `&dyn std::fmt::Debug`
   = note: the full name for the type has been written to '/Users/xxx/Code/Experiments/rs_bug_check/target/debug/deps/style-b682a841dec35937.long-type-9931116615739545653.txt'
   = note: consider using `--verbose` to print the full type name to the console
   = note: this error originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0275]: overflow evaluating the requirement `GenericTransformOperation<computed::angle::Angle, f32, CSSPixelLength, i32, length_percentage::LengthPercentage>: std::fmt::Debug`
   --> /Users/xxx/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/stylo-0.8.0/properties_and_values/value.rs:581:17
    |
581 | #[derive(Clone, Debug, MallocSizeOf, PartialEq)]
    |                 ^^^^^
    |
    = note: required for `OwnedSlice<GenericTransformOperation<Angle, f32, CSSPixelLength, i32, ...>>` to implement `std::fmt::Debug`
    = note: 5 redundant requirements hidden
    = note: required for `&Value<...>` to implement `std::fmt::Debug`
    = note: required for the cast from `&&Value<...>` to `&dyn std::fmt::Debug`
    = note: the full name for the type has been written to '/Users/xxx/Code/Experiments/rs_bug_check/target/debug/deps/style-b682a841dec35937.long-type-9931116615739545653.txt'
    = note: consider using `--verbose` to print the full type name to the console
    = note: this error originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0275]: overflow evaluating the requirement `std::boxed::Box<GenericCalcNode<CalcLengthPercentageLeaf>>: std::fmt::Debug`
   --> /Users/xxx/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/stylo-0.8.0/values/computed/length_percentage.rs:907:12
    |
907 |     Clone, Debug, Deserialize, MallocSizeOf, Serialize, ToAnimatedZero, ToResolvedValue, ToCss,
    |            ^^^^^
    |
note: required for `GenericCalcNode<CalcLengthPercentageLeaf>` to implement `std::fmt::Debug`
   --> /Users/xxx/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/stylo-0.8.0/values/generics/calc.rs:187:5
    |
187 |     Debug,
    |     ^^^^^ unsatisfied trait bound introduced in this `derive` macro
...
196 | pub enum GenericCalcNode<L> {
    |          ^^^^^^^^^^^^^^^^^^
    = note: 1 redundant requirement hidden
    = note: required for `&GenericCalcNode<CalcLengthPercentageLeaf>` to implement `std::fmt::Debug`
    = note: required for the cast from `&&GenericCalcNode<CalcLengthPercentageLeaf>` to `&dyn std::fmt::Debug`
    = note: this error originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0275]: overflow evaluating the requirement `std::boxed::Box<GenericCalcNode<Leaf>>: std::fmt::Debug`
   --> /Users/xxx/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/stylo-0.8.0/values/specified/calc.rs:129:17
    |
129 | #[derive(Clone, Debug, MallocSizeOf, PartialEq, ToCss, ToShmem)]
    |                 ^^^^^
    |
note: required for `GenericCalcNode<Leaf>` to implement `std::fmt::Debug`
   --> /Users/xxx/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/stylo-0.8.0/values/generics/calc.rs:187:5
    |
187 |     Debug,
    |     ^^^^^ unsatisfied trait bound introduced in this `derive` macro
...
196 | pub enum GenericCalcNode<L> {
    |          ^^^^^^^^^^^^^^^^^^
    = note: 1 redundant requirement hidden
    = note: required for `&GenericCalcNode<Leaf>` to implement `std::fmt::Debug`
    = note: required for the cast from `&&GenericCalcNode<Leaf>` to `&dyn std::fmt::Debug`
    = note: this error originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0275]: overflow evaluating the requirement `GenericColorMix<GenericColor<computed::percentage::Percentage>, computed::percentage::Percentage>: std::fmt::Debug`
     --> /Users/xxx/Code/Experiments/rs_bug_check/target/debug/build/stylo-564a1ed23ea6674b/out/properties.rs:15137:29
      |
15137 |             #[derive(Clone, Debug, MallocSizeOf, PartialEq, ToCss, ToTyped)]
      |                             ^^^^^
      |
      = note: required for `Box<GenericColorMix<GenericColor<Percentage>, Percentage>>` to implement `std::fmt::Debug`
      = note: 4 redundant requirements hidden
      = note: required for `&ArcSlice<GenericSimpleShadow<GenericColor<Percentage>, CSSPixelLength, ...>>` to implement `std::fmt::Debug`
      = note: required for the cast from `&&ArcSlice<GenericSimpleShadow<GenericColor<Percentage>, CSSPixelLength, ...>>` to `&dyn std::fmt::Debug`
      = note: the full name for the type has been written to '/Users/xxx/Code/Experiments/rs_bug_check/target/debug/deps/style-b682a841dec35937.long-type-7945859961858661899.txt'
      = note: consider using `--verbose` to print the full type name to the console
      = note: this error originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0275]: overflow evaluating the requirement `GenericColorMix<GenericColor<computed::percentage::Percentage>, computed::percentage::Percentage>: std::fmt::Debug`
     --> /Users/xxx/Code/Experiments/rs_bug_check/target/debug/build/stylo-564a1ed23ea6674b/out/properties.rs:44316:10
      |
44316 | #[derive(Debug, MallocSizeOf)]
      |          ^^^^^
      |
      = note: required for `Box<GenericColorMix<GenericColor<Percentage>, Percentage>>` to implement `std::fmt::Debug`
      = note: 6 redundant requirements hidden
      = note: required for `&OwnedList<GenericFilter<Angle, f32, f32, CSSPixelLength, ..., ...>>` to implement `std::fmt::Debug`
      = note: required for the cast from `&&OwnedList<GenericFilter<Angle, f32, f32, CSSPixelLength, ..., ...>>` to `&dyn std::fmt::Debug`
      = note: the full name for the type has been written to '/Users/xxx/Code/Experiments/rs_bug_check/target/debug/deps/style-b682a841dec35937.long-type-7945859961858661899.txt'
      = note: consider using `--verbose` to print the full type name to the console
      = note: this error originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0275]: overflow evaluating the requirement `GenericColorMix<GenericColor<computed::percentage::Percentage>, computed::percentage::Percentage>: std::fmt::Debug`
     --> /Users/xxx/Code/Experiments/rs_bug_check/target/debug/build/stylo-564a1ed23ea6674b/out/properties.rs:67843:25
      |
67843 |         #[derive(Clone, Debug, MallocSizeOf, PartialEq)]
      |                         ^^^^^
      |
      = note: required for `Box<GenericColorMix<GenericColor<Percentage>, Percentage>>` to implement `std::fmt::Debug`
      = note: 2 redundant requirements hidden
      = note: required for `&GenericColor<computed::percentage::Percentage>` to implement `std::fmt::Debug`
      = note: required for the cast from `&&GenericColor<computed::percentage::Percentage>` to `&dyn std::fmt::Debug`
      = note: the full name for the type has been written to '/Users/xxx/Code/Experiments/rs_bug_check/target/debug/deps/style-b682a841dec35937.long-type-7945859961858661899.txt'
      = note: consider using `--verbose` to print the full type name to the console
      = note: this error originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0275]: overflow evaluating the requirement `GenericColorMix<GenericColor<computed::percentage::Percentage>, computed::percentage::Percentage>: std::fmt::Debug`
     --> /Users/xxx/Code/Experiments/rs_bug_check/target/debug/build/stylo-564a1ed23ea6674b/out/properties.rs:68094:25
      |
68094 |         #[derive(Clone, Debug, MallocSizeOf, PartialEq)]
      |                         ^^^^^
      |
      = note: required for `Box<GenericColorMix<GenericColor<Percentage>, Percentage>>` to implement `std::fmt::Debug`
      = note: 2 redundant requirements hidden
      = note: required for `&GenericColor<computed::percentage::Percentage>` to implement `std::fmt::Debug`
      = note: required for the cast from `&&GenericColor<computed::percentage::Percentage>` to `&dyn std::fmt::Debug`
      = note: the full name for the type has been written to '/Users/xxx/Code/Experiments/rs_bug_check/target/debug/deps/style-b682a841dec35937.long-type-7945859961858661899.txt'
      = note: consider using `--verbose` to print the full type name to the console
      = note: this error originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0275]: overflow evaluating the requirement `GenericTransformOperation<computed::angle::Angle, f32, CSSPixelLength, i32, length_percentage::LengthPercentage>: std::fmt::Debug`
     --> /Users/xxx/Code/Experiments/rs_bug_check/target/debug/build/stylo-564a1ed23ea6674b/out/properties.rs:68693:25
      |
68693 |         #[derive(Clone, Debug, MallocSizeOf, PartialEq)]
      |                         ^^^^^
      |
      = note: required for `OwnedSlice<GenericTransformOperation<Angle, f32, CSSPixelLength, i32, ...>>` to implement `std::fmt::Debug`
      = note: 2 redundant requirements hidden
      = note: required for `&GenericTransform<GenericTransformOperation<Angle, f32, ..., i32, ...>>` to implement `std::fmt::Debug`
      = note: required for the cast from `&&GenericTransform<GenericTransformOperation<Angle, f32, ..., i32, ...>>` to `&dyn std::fmt::Debug`
      = note: the full name for the type has been written to '/Users/xxx/Code/Experiments/rs_bug_check/target/debug/deps/style-b682a841dec35937.long-type-9931116615739545653.txt'
      = note: consider using `--verbose` to print the full type name to the console
      = note: this error originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0275]: overflow evaluating the requirement `GenericColorMix<GenericColor<computed::percentage::Percentage>, computed::percentage::Percentage>: std::fmt::Debug`
     --> /Users/xxx/Code/Experiments/rs_bug_check/target/debug/build/stylo-564a1ed23ea6674b/out/properties.rs:69604:25
      |
69604 |         #[derive(Clone, Debug, MallocSizeOf, PartialEq)]
      |                         ^^^^^
      |
      = note: required for `Box<GenericColorMix<GenericColor<Percentage>, Percentage>>` to implement `std::fmt::Debug`
      = note: 6 redundant requirements hidden
      = note: required for `&OwnedList<GenericBoxShadow<GenericColor<Percentage>, CSSPixelLength, ..., ...>>` to implement `std::fmt::Debug`
      = note: required for the cast from `&&OwnedList<GenericBoxShadow<GenericColor<Percentage>, CSSPixelLength, ..., ...>>` to `&dyn std::fmt::Debug`
      = note: the full name for the type has been written to '/Users/xxx/Code/Experiments/rs_bug_check/target/debug/deps/style-b682a841dec35937.long-type-7945859961858661899.txt'
      = note: consider using `--verbose` to print the full type name to the console
      = note: this error originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0275]: overflow evaluating the requirement `GenericColorMix<GenericColor<computed::percentage::Percentage>, computed::percentage::Percentage>: std::fmt::Debug`
     --> /Users/xxx/Code/Experiments/rs_bug_check/target/debug/build/stylo-564a1ed23ea6674b/out/properties.rs:71096:25
      |
71096 |         #[derive(Clone, Debug, MallocSizeOf, PartialEq)]
      |                         ^^^^^
      |
      = note: required for `Box<GenericColorMix<GenericColor<Percentage>, Percentage>>` to implement `std::fmt::Debug`
      = note: 2 redundant requirements hidden
      = note: required for `&GenericColor<computed::percentage::Percentage>` to implement `std::fmt::Debug`
      = note: required for the cast from `&&GenericColor<computed::percentage::Percentage>` to `&dyn std::fmt::Debug`
      = note: the full name for the type has been written to '/Users/xxx/Code/Experiments/rs_bug_check/target/debug/deps/style-b682a841dec35937.long-type-7945859961858661899.txt'
      = note: consider using `--verbose` to print the full type name to the console
      = note: this error originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0275]: overflow evaluating the requirement `Optional<GenericInset<computed::percentage::Percentage, length_percentage::LengthPercentage>>: std::fmt::Debug`
     --> /Users/xxx/Code/Experiments/rs_bug_check/target/debug/build/stylo-564a1ed23ea6674b/out/properties.rs:71334:25
      |
71334 |         #[derive(Clone, Debug, MallocSizeOf, PartialEq)]
      |                         ^^^^^
      |
note: required for `GenericAnchorFunction<Percentage, GenericInset<Percentage, LengthPercentage>>` to implement `std::fmt::Debug`
     --> /Users/xxx/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/stylo-0.8.0/values/generics/position.rs:338:5
      |
  338 |     Debug,
      |     ^^^^^ unsatisfied trait bound introduced in this `derive` macro
...
  351 | pub struct GenericAnchorFunction<Percentage, Fallback> {
      |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      = note: 3 redundant requirements hidden
      = note: required for `&GenericInset<computed::percentage::Percentage, length_percentage::LengthPercentage>` to implement `std::fmt::Debug`
      = note: required for the cast from `&&GenericInset<computed::percentage::Percentage, length_percentage::LengthPercentage>` to `&dyn std::fmt::Debug`
      = note: the full name for the type has been written to '/Users/xxx/Code/Experiments/rs_bug_check/target/debug/deps/style-b682a841dec35937.long-type-1410937979108995732.txt'
      = note: consider using `--verbose` to print the full type name to the console
      = note: this error originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0275]: overflow evaluating the requirement `GenericColorMix<GenericColor<computed::percentage::Percentage>, computed::percentage::Percentage>: std::fmt::Debug`
     --> /Users/xxx/Code/Experiments/rs_bug_check/target/debug/build/stylo-564a1ed23ea6674b/out/properties.rs:72492:25
      |
72492 |         #[derive(Clone, Debug, MallocSizeOf, PartialEq)]
      |                         ^^^^^
      |
      = note: required for `Box<GenericColorMix<GenericColor<Percentage>, Percentage>>` to implement `std::fmt::Debug`
      = note: 2 redundant requirements hidden
      = note: required for `&GenericColor<computed::percentage::Percentage>` to implement `std::fmt::Debug`
      = note: required for the cast from `&&GenericColor<computed::percentage::Percentage>` to `&dyn std::fmt::Debug`
      = note: the full name for the type has been written to '/Users/xxx/Code/Experiments/rs_bug_check/target/debug/deps/style-b682a841dec35937.long-type-7945859961858661899.txt'
      = note: consider using `--verbose` to print the full type name to the console
      = note: this error originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)

For more information about this error, try `rustc --explain E0275`.
error: could not compile `stylo` (lib) due to 14 previous errors

[dxvid-pts]

I am not sure if this is a stylo issue or an issue with the rust compiler. Also filed rust-lang/rust#148255

[nicoburns]

This looks like a rustc bug to me GenericCalcNode is a recursive type. But I believe deriving Debug of a recursive type is valid (and it has been working for several years). Does this happen with older rust versions?

[dxvid-pts]

This bug does not happen with stylo 0.3.0 and first starts appearing with stylo 0.4.0. The lowest Rust version that 0.4.0 supports is Rust 1.83.0 and on that version combination it is also reproducable.

[nicoburns]

This happens when the debug feature of derive_more is enabled. Because Stylo is importing derive_mores derive macros using #[macro_use], merely enabling the feature causes Stylo to use derive_more's derive macro for the Debug trait rather than stds derive macro for the Debug trait. And for whatever reason Stylo is not compatible with derive_mores Debug macro.

The fix is to move Stylo to importing macros with use:: rather than #[macro_use]. I have local patches for this which I will submit upstream.

https://bugzilla.mozilla.org/show_bug.cgi?id=2005254