0be4e0ec50
Statement macros are now treated somewhat like item macros, in that a statement macro can now expand into a series of statements, rather than just a single statement. This allows statement macros to be nested inside other kinds of macros and expand properly, where previously the expansion would only work when no nesting was present. See: - `src/test/run-pass/macro-stmt_macro_in_expr_macro.rs` - `src/test/run-pass/macro-nested_stmt_macro.rs` This changes the interface of the MacResult trait. make_stmt has become make_stmts and now returns a vector, rather than a single item. Plugin writers who were implementing MacResult will have breakage, as well as anyone using MacEager::stmt. See: - `src/libsyntax/ext/base.rs` This also causes a minor difference in behavior to the diagnostics produced by certain malformed macros. See: - `src/test/compile-fail/macro-incomplete-parse.rs`
37 lines
1.1 KiB
Rust
37 lines
1.1 KiB
Rust
// Copyright 2013 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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macro_rules! ignored_item {
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() => {
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fn foo() {}
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fn bar() {}
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, //~ ERROR macro expansion ignores token `,`
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}
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}
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macro_rules! ignored_expr {
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() => ( 1, //~ ERROR unexpected token: `,`
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2 ) //~ ERROR macro expansion ignores token `2`
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}
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macro_rules! ignored_pat {
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() => ( 1, 2 ) //~ ERROR macro expansion ignores token `,`
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}
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ignored_item!(); //~ NOTE caused by the macro expansion here
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fn main() {
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ignored_expr!(); //~ NOTE caused by the macro expansion here
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match 1 {
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ignored_pat!() => (), //~ NOTE caused by the macro expansion here
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_ => (),
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}
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}
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