diff options
| -rw-r--r-- | compiler/rustc_hir/src/def.rs | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/compiler/rustc_hir/src/def.rs b/compiler/rustc_hir/src/def.rs index 3276f516a52..0b7ffc4af45 100644 --- a/compiler/rustc_hir/src/def.rs +++ b/compiler/rustc_hir/src/def.rs @@ -109,7 +109,16 @@ pub enum DefKind { Use, /// An `extern` block. ForeignMod, - /// Anonymous constant, e.g. the `1 + 2` in `[u8; 1 + 2]` + /// Anonymous constant, e.g. the `1 + 2` in `[u8; 1 + 2]`. + /// + /// Not all anon-consts are actually still relevant in the HIR. We lower + /// trivial const-arguments directly to `hir::ConstArgKind::Path`, at which + /// point the definition for the anon-const ends up unused and incomplete. + /// + /// We do not provide any a `Span` for the definition and pretty much all other + /// queries also ICE when using this `DefId`. Given that the `DefId` of such + /// constants should only be reachable by iterating all definitions of a + /// given crate, you should not have to worry about this. AnonConst, /// An inline constant, e.g. `const { 1 + 2 }` InlineConst, |