rustc-ap-syntax 640.0.0

Automatically published version of the package `syntax` in the rust-lang/rust repository from commit 67fae2241ba7d07f455754dcca2c90327b16c098 The publishing script for this crate lives at: https://github.com/alexcrichton/rustc-auto-publish
Documentation 
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//! Routines the parser uses to classify AST nodes

// Predicates on exprs and stmts that the pretty-printer and parser use

use crate::ast;

/// Does this expression require a semicolon to be treated
/// as a statement? The negation of this: 'can this expression
/// be used as a statement without a semicolon' -- is used
/// as an early-bail-out in the parser so that, for instance,
///     if true {...} else {...}
///      |x| 5
/// isn't parsed as (if true {...} else {...} | x) | 5
pub fn expr_requires_semi_to_be_stmt(e: &ast::Expr) -> bool {
    match e.kind {
        ast::ExprKind::If(..)
        | ast::ExprKind::Match(..)
        | ast::ExprKind::Block(..)
        | ast::ExprKind::While(..)
        | ast::ExprKind::Loop(..)
        | ast::ExprKind::ForLoop(..)
        | ast::ExprKind::TryBlock(..) => false,
        _ => true,
    }
}