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106 lines
2.7 KiB
Plaintext
106 lines
2.7 KiB
Plaintext
#![feature(prelude_import)]
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#![no_std]
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//@ compile-flags: -Zunpretty=expanded
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//@ check-pass
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// This test covers the AST pretty-printer's insertion of parentheses in some
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// macro metavariable edge cases. Synthetic parentheses (i.e. not appearing in
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// the syntax tree) need to be printed in order for the printed code to be valid
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// Rust syntax. We also test negative cases: the pretty-printer should not be
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// synthesizing parentheses indiscriminately; only where necessary.
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#![feature(let_chains)]
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#![feature(if_let_guard)]
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#[prelude_import]
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use ::std::prelude::rust_2015::*;
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#[macro_use]
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extern crate std;
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macro_rules! expr { ($expr:expr) => { $expr }; }
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macro_rules! stmt { ($stmt:stmt) => { $stmt }; }
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fn break_labeled_loop() {
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let no_paren =
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'outer: loop { break 'outer 'inner: loop { break 'inner 1; } + 1; };
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let paren_around_break_value =
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'outer: loop { break ('inner: loop { break 'inner 1; } + 1); };
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macro_rules! breaking { ($value:expr) => { break $value }; }
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let paren_around_break_value =
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loop { break ('inner: loop { break 'inner 1; } + 1); };
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}
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fn if_let() {
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macro_rules! if_let {
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($pat:pat, $expr:expr) => { if let $pat = $expr {} };
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}
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if let no_paren = true && false {}
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if let paren_around_binary = (true && false) {};
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if let no_paren = true {};
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struct Struct {}
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match () { _ if let no_paren = Struct {} => {} }
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}
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fn let_else() {
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let no_paren = 1 + 1 else { return; };
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let paren_around_loop = (loop {}) else { return; };
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}
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fn local() {
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macro_rules! let_expr_minus_one {
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($pat:pat, $expr:expr) => { let $pat = $expr - 1; };
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}
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let void;
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let no_paren = match void {} - 1;
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macro_rules! let_expr_else_return {
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($pat:pat, $expr:expr) => { let $pat = $expr else { return; }; };
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}
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let
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no_paren = void() else { return; };
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}
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fn match_arm() {
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macro_rules! match_arm {
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($pat:pat, $expr:expr) => { match () { $pat => $expr } };
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}
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match () {
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no_paren => 1 - 1,
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};
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match () { paren_around_brace => ({ 1 }) - 1, };
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}
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/// https://github.com/rust-lang/rust/issues/98790
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fn stmt_boundary() {
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macro_rules! expr_as_stmt { ($expr:expr) => { stmt!($expr) }; }
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let paren_around_match;
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(match paren_around_match {}) | true;
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macro_rules! minus_one { ($expr:expr) => { expr_as_stmt!($expr - 1) }; }
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let (no_paren, paren_around_loop);
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no_paren - 1;
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(match paren_around_match {}) - 1;
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(match paren_around_match {})() - 1;
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(match paren_around_match {})[0] - 1;
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(loop { break paren_around_loop; }) - 1;
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}
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fn vis_inherited() {
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macro_rules! vis_inherited {
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($vis:vis struct) => { $vis struct Struct; };
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}
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struct Struct;
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}
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