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use crate::ast;
use crate::{Parse, Spanned, ToTokens};
/// A block expression.
///
/// # Examples
///
/// ```rust
/// use rune::{testing, ast};
///
/// let expr = testing::roundtrip::<ast::ExprBlock>("async {}");
/// assert_eq!(expr.block.statements.len(), 0);
///
/// let expr = testing::roundtrip::<ast::ExprBlock>("async { 42 }");
/// assert_eq!(expr.block.statements.len(), 1);
///
/// let expr = testing::roundtrip::<ast::ExprBlock>("#[retry] async { 42 }");
/// assert_eq!(expr.block.statements.len(), 1);
/// assert_eq!(expr.attributes.len(), 1);
/// ```
#[derive(Debug, Clone, PartialEq, Eq, Parse, ToTokens, Spanned)]
#[rune(parse = "meta_only")]
pub struct ExprBlock {
/// The attributes for the block.
#[rune(iter, meta)]
pub attributes: Vec<ast::Attribute>,
/// The optional async token.
#[rune(iter, meta)]
pub async_token: Option<T![async]>,
/// The optional const token.
#[rune(iter, meta)]
pub const_token: Option<T![const]>,
/// The optional move token.
#[rune(iter, meta)]
pub move_token: Option<T![move]>,
/// The close brace.
pub block: ast::Block,
}
expr_parse!(Block, ExprBlock, "block expression");