cache type info for ParamEnv

1 files changed, 9 insertions, 0 deletions

diff --git a/compiler/rustc_middle/src/ty/flags.rs b/compiler/rustc_middle/src/ty/flags.rs
index ca9c762611e..5feb6ef76d5 100644
--- a/compiler/rustc_middle/src/ty/flags.rs
+++ b/compiler/rustc_middle/src/ty/flags.rs
@@ -35,6 +35,15 @@ impl FlagComputation {
         result
     }
 
+    pub fn for_clauses(clauses: &[ty::Clause<'_>]) -> FlagComputation {
+        let mut result = FlagComputation::new();
+        for c in clauses {
+            result.add_flags(c.as_predicate().flags());
+            result.add_exclusive_binder(c.as_predicate().outer_exclusive_binder());
+        }
+        result
+    }
+
     fn add_flags(&mut self, flags: TypeFlags) {
         self.flags = self.flags | flags;
     }