diff options
| -rw-r--r-- | src/librustc_driver/driver.rs | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/src/librustc_driver/driver.rs b/src/librustc_driver/driver.rs index c086737b640..69c4dcb0a19 100644 --- a/src/librustc_driver/driver.rs +++ b/src/librustc_driver/driver.rs @@ -46,6 +46,7 @@ use syntax::ast::{self, NodeIdAssigner}; use syntax::attr; use syntax::attr::AttrMetaMethods; use syntax::diagnostics; +use syntax::feature_gate::UnstableFeatures; use syntax::fold::Folder; use syntax::parse; use syntax::parse::token; @@ -750,9 +751,18 @@ pub fn phase_3_run_analysis_passes<'tcx, F, R>(sess: &'tcx Session, time(time_passes, "match checking", || middle::check_match::check_crate(tcx)); - let _mir_map = - time(time_passes, "MIR dump", || - mir::mir_map::build_mir_for_crate(tcx)); + match tcx.sess.opts.unstable_features { + UnstableFeatures::Disallow => { + // use this as a shorthand for beta/stable, and skip + // MIR construction there until known regressions are + // addressed + } + UnstableFeatures::Allow | UnstableFeatures::Cheat => { + let _mir_map = + time(time_passes, "MIR dump", || + mir::mir_map::build_mir_for_crate(tcx)); + } + } time(time_passes, "liveness checking", || middle::liveness::check_crate(tcx)); |