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| author | Alex Kitchens <alex.kitchens@stitchfix.com> | 2018-05-22 16:30:05 -0500 |
|---|---|---|
| committer | Who? Me?! <mark-i-m@users.noreply.github.com> | 2018-05-22 17:06:58 -0500 |
| commit | d6df2a2f92b17a367d771ff3f89592250663023f (patch) | |
| tree | f55ca5100cf6a67a74b0d4b428adbc529211905d /src/doc/rustc-dev-guide | |
| parent | 577f8ddba62b10f4434a0291234ca86fd1d13051 (diff) | |
| download | rust-d6df2a2f92b17a367d771ff3f89592250663023f.tar.gz rust-d6df2a2f92b17a367d771ff3f89592250663023f.zip | |
Define a Cycle
I wasn't clear on what a Cycle was when reading through the document. Defining it will be helpful for other readers not familiar with it as well.
Diffstat (limited to 'src/doc/rustc-dev-guide')
| -rw-r--r-- | src/doc/rustc-dev-guide/src/query.md | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/doc/rustc-dev-guide/src/query.md b/src/doc/rustc-dev-guide/src/query.md index 2c518ee55ee..d48b6e7e3da 100644 --- a/src/doc/rustc-dev-guide/src/query.md +++ b/src/doc/rustc-dev-guide/src/query.md @@ -47,6 +47,9 @@ let ty = tcx.type_of(some_def_id); ### Cycles between queries +A cycle is when a query becomes stuck in a loop e.g. query A generates query B +which generates query A again. + Currently, cycles during query execution should always result in a compilation error. Typically, they arise because of illegal programs that contain cyclic references they shouldn't (though sometimes they |