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https://github.com/rust-lang/rust
synced 2024-09-15 22:50:55 +00:00
parent
04145943a2
commit
0b29d26079
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@ -562,6 +562,17 @@ macro_rules! unimplemented {
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///
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/// For more information, see documentation for `std`'s macros.
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mod builtin {
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/// Unconditionally causes compilation to fail with the given error message when encountered.
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///
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/// For more information, see the [RFC].
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///
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/// [RFC]: https://github.com/rust-lang/rfcs/blob/master/text/1695-add-error-macro.md
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#[unstable(feature = "compile_error_macro", issue = "40872")]
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#[macro_export]
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#[cfg(dox)]
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macro_rules! compile_error { ($msg:expr) => ({ /* compiler built-in */ }) }
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/// The core macro for formatted string creation & output.
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///
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/// For more information, see the documentation for [`std::format_args!`].
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@ -238,6 +238,16 @@ macro_rules! assert_approx_eq {
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/// into libsyntax itself.
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#[cfg(dox)]
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pub mod builtin {
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/// Unconditionally causes compilation to fail with the given error message when encountered.
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///
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/// For more information, see the [RFC].
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///
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/// [RFC]: https://github.com/rust-lang/rfcs/blob/master/text/1695-add-error-macro.md
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#[unstable(feature = "compile_error_macro", issue = "40872")]
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#[macro_export]
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macro_rules! compile_error { ($msg:expr) => ({ /* compiler built-in */ }) }
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/// The core macro for formatted string creation & output.
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///
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/// This macro produces a value of type [`fmt::Arguments`]. This value can be
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@ -1065,6 +1065,7 @@ fn enable_trace_macros = trace_macros,
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fn enable_allow_internal_unstable = allow_internal_unstable,
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fn enable_custom_derive = custom_derive,
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fn proc_macro_enabled = proc_macro,
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fn enable_compile_error = compile_error,
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}
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}
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@ -111,6 +111,7 @@ pub fn new() -> Features {
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declare_features! (
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(active, asm, "1.0.0", Some(29722)),
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(active, compile_error, "1.20.0", Some(40872)),
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(active, concat_idents, "1.0.0", Some(29599)),
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(active, link_args, "1.0.0", Some(29596)),
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(active, log_syntax, "1.0.0", Some(29598)),
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@ -1008,6 +1009,9 @@ pub fn feature_err<'a>(sess: &'a ParseSess, feature: &str, span: Span, issue: Ga
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pub const EXPLAIN_CONCAT_IDENTS: &'static str =
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"`concat_idents` is not stable enough for use and is subject to change";
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pub const EXPLAIN_COMPILE_ERROR: &'static str =
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"`compile_error` is not stable enough for use and is subject to change";
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pub const EXPLAIN_TRACE_MACROS: &'static str =
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"`trace_macros` is not stable enough for use and is subject to change";
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pub const EXPLAIN_ALLOW_INTERNAL_UNSTABLE: &'static str =
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40
src/libsyntax_ext/compile_error.rs
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40
src/libsyntax_ext/compile_error.rs
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@ -0,0 +1,40 @@
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// Copyright 2012-2017 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// The compiler code necessary to support the compile_error! extension.
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use syntax::ext::base::*;
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use syntax::ext::base;
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use syntax::feature_gate;
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use syntax_pos::Span;
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use syntax::tokenstream;
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pub fn expand_compile_error<'cx>(cx: &'cx mut ExtCtxt,
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sp: Span,
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tts: &[tokenstream::TokenTree])
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-> Box<base::MacResult + 'cx> {
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if !cx.ecfg.enable_compile_error() {
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feature_gate::emit_feature_err(&cx.parse_sess,
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"compile_error",
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sp,
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feature_gate::GateIssue::Language,
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feature_gate::EXPLAIN_COMPILE_ERROR);
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return DummyResult::expr(sp);
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}
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let var = match get_single_str_from_tts(cx, sp, tts, "compile_error!") {
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None => return DummyResult::expr(sp),
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Some(v) => v,
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};
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cx.span_err(sp, &var);
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DummyResult::any(sp)
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}
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@ -34,6 +34,7 @@
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mod asm;
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mod cfg;
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mod compile_error;
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mod concat;
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mod concat_idents;
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mod env;
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@ -109,6 +110,7 @@ macro_rules! register {
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option_env: env::expand_option_env,
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log_syntax: log_syntax::expand_syntax_ext,
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trace_macros: trace_macros::expand_trace_macros,
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compile_error: compile_error::expand_compile_error,
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}
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// format_args uses `unstable` things internally.
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15
src/test/compile-fail/compile_error_macro.rs
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15
src/test/compile-fail/compile_error_macro.rs
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@ -0,0 +1,15 @@
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// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![feature(compile_error)]
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fn main() {
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compile_error!("a very descriptive error message"); //~ ERROR: a very descriptive error message
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}
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13
src/test/compile-fail/feature-gate-compile_error.rs
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13
src/test/compile-fail/feature-gate-compile_error.rs
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@ -0,0 +1,13 @@
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// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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fn main() {
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compile_error!("test"); //~ ERROR: `compile_error` is not stable enough
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}
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