From 6d09d8d7d93b4c7d4387d8a1510924df1d67c05d Mon Sep 17 00:00:00 2001 From: Tim Neumann Date: Sat, 24 Sep 2016 19:04:07 +0200 Subject: add unstable_features to ParseSess --- src/libsyntax/feature_gate.rs | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'src/libsyntax/feature_gate.rs') diff --git a/src/libsyntax/feature_gate.rs b/src/libsyntax/feature_gate.rs index f8eb4508b16..2b4f03bd4f6 100644 --- a/src/libsyntax/feature_gate.rs +++ b/src/libsyntax/feature_gate.rs @@ -36,6 +36,7 @@ use parse::ParseSess; use parse::token::InternedString; use std::ascii::AsciiExt; +use std::env; macro_rules! setter { ($field: ident) => {{ @@ -1296,6 +1297,23 @@ pub enum UnstableFeatures { Cheat } +impl UnstableFeatures { + pub fn from_environment() -> UnstableFeatures { + // Whether this is a feature-staged build, i.e. on the beta or stable channel + let disable_unstable_features = option_env!("CFG_DISABLE_UNSTABLE_FEATURES").is_some(); + // The secret key needed to get through the rustc build itself by + // subverting the unstable features lints + let bootstrap_secret_key = option_env!("CFG_BOOTSTRAP_KEY"); + // The matching key to the above, only known by the build system + let bootstrap_provided_key = env::var("RUSTC_BOOTSTRAP_KEY").ok(); + match (disable_unstable_features, bootstrap_secret_key, bootstrap_provided_key) { + (_, Some(ref s), Some(ref p)) if s == p => UnstableFeatures::Cheat, + (true, _, _) => UnstableFeatures::Disallow, + (false, _, _) => UnstableFeatures::Allow + } + } +} + fn maybe_stage_features(span_handler: &Handler, krate: &ast::Crate, unstable: UnstableFeatures) { let allow_features = match unstable { -- cgit 1.4.1-3-g733a5