add comment per @nikomatsakis request

2017-09-21 11:19:52 -04:00 · 2017-09-21 11:19:52 -04:00 · 119882eaa5
commit 119882eaa5
parent c900abf42d
1 changed files with 1 additions and 0 deletions
--- a/src/librustc/traits/trans/mod.rs
+++ b/src/librustc/traits/trans/mod.rs
@ -31,6 +31,7 @@ impl<'a, 'tcx> TyCtxt<'a, 'tcx, 'tcx> {
    /// (necessarily) resolve all nested obligations on the impl. Note
    /// that type check should guarantee to us that all nested
    /// obligations *could be* resolved if we wanted to.
+    /// Assumes that this is run after the entire crate has been successfully type-checked.
    pub fn trans_fulfill_obligation(self,
                                    span: Span,
                                    param_env: ty::ParamEnv<'tcx>,