Remove the push_unsafe! and pop_unsafe! macros.

This is a [breaking change].

2 files changed, 0 insertions, 100 deletions

diff --git a/src/libsyntax/ext/base.rs b/src/libsyntax/ext/base.rs
index 6196062b08a..ef26c1deae7 100644
--- a/src/libsyntax/ext/base.rs
+++ b/src/libsyntax/ext/base.rs
@@ -544,12 +544,6 @@ fn initial_syntax_expander_table<'feat>(ecfg: &expand::ExpansionConfig<'feat>)
     syntax_expanders.insert(intern("cfg"),
                             builtin_normal_expander(
                                     ext::cfg::expand_cfg));
-    syntax_expanders.insert(intern("push_unsafe"),
-                            builtin_normal_expander(
-                                ext::pushpop_safe::expand_push_unsafe));
-    syntax_expanders.insert(intern("pop_unsafe"),
-                            builtin_normal_expander(
-                                ext::pushpop_safe::expand_pop_unsafe));
     syntax_expanders.insert(intern("trace_macros"),
                             builtin_normal_expander(
                                     ext::trace_macros::expand_trace_macros));
diff --git a/src/libsyntax/ext/pushpop_safe.rs b/src/libsyntax/ext/pushpop_safe.rs
deleted file mode 100644
index a67d550d3cd..00000000000
--- a/src/libsyntax/ext/pushpop_safe.rs
+++ /dev/null
@@ -1,94 +0,0 @@
-// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-/*
- * The compiler code necessary to support the `push_unsafe!` and
- * `pop_unsafe!` macros.
- *
- * This is a hack to allow a kind of "safety hygiene", where a macro
- * can generate code with an interior expression that inherits the
- * safety of some outer context.
- *
- * For example, in:
- *
- * ```rust
- * fn foo() { push_unsafe!( { EXPR_1; pop_unsafe!( EXPR_2 ) } ) }
- * ```
- *
- * the `EXPR_1` is considered to be in an `unsafe` context,
- * but `EXPR_2` is considered to be in a "safe" (i.e. checked) context.
- *
- * For comparison, in:
- *
- * ```rust
- * fn foo() { unsafe { push_unsafe!( { EXPR_1; pop_unsafe!( EXPR_2 ) } ) } }
- * ```
- *
- * both `EXPR_1` and `EXPR_2` are considered to be in `unsafe`
- * contexts.
- *
- */
-
-use ast;
-use codemap::Span;
-use ext::base::*;
-use ext::base;
-use ext::build::AstBuilder;
-use feature_gate;
-use ptr::P;
-
-enum PushPop { Push, Pop }
-
-pub fn expand_push_unsafe<'cx>(cx: &'cx mut ExtCtxt, sp: Span, tts: &[ast::TokenTree])
-                               -> Box<base::MacResult+'cx> {
-    expand_pushpop_unsafe(cx, sp, tts, PushPop::Push)
-}
-
-pub fn expand_pop_unsafe<'cx>(cx: &'cx mut ExtCtxt, sp: Span, tts: &[ast::TokenTree])
-                               -> Box<base::MacResult+'cx> {
-    expand_pushpop_unsafe(cx, sp, tts, PushPop::Pop)
-}
-
-fn expand_pushpop_unsafe<'cx>(cx: &'cx mut ExtCtxt, sp: Span, tts: &[ast::TokenTree],
-                                  pp: PushPop) -> Box<base::MacResult+'cx> {
-    feature_gate::check_for_pushpop_syntax(
-        cx.ecfg.features, &cx.parse_sess.span_diagnostic, sp);
-
-    let mut exprs = match get_exprs_from_tts(cx, sp, tts) {
-        Some(exprs) => exprs.into_iter(),
-        None => return DummyResult::expr(sp),
-    };
-
-    let expr = match (exprs.next(), exprs.next()) {
-        (Some(expr), None) => expr,
-        _ => {
-            let msg = match pp {
-                PushPop::Push => "push_unsafe! takes 1 arguments",
-                PushPop::Pop => "pop_unsafe! takes 1 arguments",
-            };
-            cx.span_err(sp, msg);
-            return DummyResult::expr(sp);
-        }
-    };
-
-    let source = ast::UnsafeSource::CompilerGenerated;
-    let check_mode = match pp {
-        PushPop::Push => ast::BlockCheckMode::PushUnsafeBlock(source),
-        PushPop::Pop => ast::BlockCheckMode::PopUnsafeBlock(source),
-    };
-
-    MacEager::expr(cx.expr_block(P(ast::Block {
-        stmts: vec![],
-        expr: Some(expr),
-        id: ast::DUMMY_NODE_ID,
-        rules: check_mode,
-        span: sp
-    })))
-}