macro-with-braces-in-expr-position.rs

//@ run-pass
#![allow(unused_must_use)]
//@ needs-threads

use std::thread;

macro_rules! expr { ($e: expr) => { $e } }

macro_rules! spawn {
    ($($code: tt)*) => {
        expr!(thread::spawn(move|| {$($code)*}).join())
    }
}

pub fn main() {
    spawn! {
        println!("stmt");
    };
    let _ = spawn! {
        println!("expr");
    };
}

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// Declarative Macros
//
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// Metavariables
//
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// Macro Expansion
//
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// Macro Invocation
//
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// Macro Matching
//
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// Macro Transcription
//
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// Repetition
//
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// Rule Matching
//
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// Token Matching
//
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// Weak Keywords