queries overflow the depth limit! (core)
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C-bug
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- Dominant language
- Rust
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Description
error: queries overflow the depth limit!
--> ~/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/num/niche_types.rs:20:41
|
20 | $vis struct $name(pattern_type!($int is $pat));
| ^^^^
...
115 | / define_valid_range_type! {
116 | | pub struct NonZeroU8Inner(u8 is 1..);
117 | | pub struct NonZeroU16Inner(u16 is 1..);
118 | | pub struct NonZeroU32Inner(u32 is 1..);
... |
138 | | pub struct NonZeroCharInner(char is '\u{1}' ..= '\u{10ffff}');
139 | | }
| |_- in this macro invocation
|
= help: consider increasing the recursion limit by adding a `#![recursion_limit = "256"]` attribute to your crate (`example1`)
= note: query depth increased by 2 when simplifying constant for the type system `<u16 as core::pat::RangePattern>::MAX`
= note: this error originates in the macro `define_valid_range_type` (in Nightly builds, run with -Z macro-backtrace for more info)
idk really i just updated the compiler (with cargo clean after it)
rustc 1.99.0-nightly (0e29c21d9 2026-07-21)
binary: rustc
commit-hash: 0e29c21d93abc9bdc330182be1fbd33cfd5fee68
commit-date: 2026-07-21
host: x86_64-unknown-linux-gnu
release: 1.99.0-nightly
LLVM version: 22.1.8
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Reproduce the report with rustc 1.99.0-nightly and the shown compiler output, then inspect library/core/src/num/niche_types.rs around define_valid_range_type!. Determine why simplifying the RangePattern constant exceeds the query depth limit; done means the reported case compiles without requiring a crate-level recursion_limit increase.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- rust
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Quiet
- Clarity
- Needs clarification
- Newbie friendliness
- 35/100