Lifetime variance fixes for rustc

compiler/rustc_mir_dataflow/src/framework/tests.rs

@@ -14,7 +14,7 @@ use super::*;
 ///
 /// This is the `Body` that will be used by the `MockAnalysis` below. The shape of its CFG is not
 /// important.
-fn mock_body() -> mir::Body<'static> {
+fn mock_body<'tcx>() -> mir::Body<'tcx> {
     let source_info = mir::SourceInfo::outermost(DUMMY_SP);
 
     let mut blocks = IndexVec::new();