1 //! Routines the parser uses to classify AST nodes
2 
3 // Predicates on exprs and stmts that the pretty-printer and parser use
4 
5 use crate::ast;
6 
7 /// Does this expression require a semicolon to be treated
8 /// as a statement? The negation of this: 'can this expression
9 /// be used as a statement without a semicolon' -- is used
10 /// as an early-bail-out in the parser so that, for instance,
11 ///     if true {...} else {...}
12 ///      |x| 5
13 /// isn't parsed as (if true {...} else {...} | x) | 5
expr_requires_semi_to_be_stmt(e: &ast::Expr) -> bool14 pub fn expr_requires_semi_to_be_stmt(e: &ast::Expr) -> bool {
15     !matches!(
16         e.kind,
17         ast::ExprKind::If(..)
18             | ast::ExprKind::Match(..)
19             | ast::ExprKind::Block(..)
20             | ast::ExprKind::While(..)
21             | ast::ExprKind::Loop(..)
22             | ast::ExprKind::ForLoop(..)
23             | ast::ExprKind::TryBlock(..)
24     )
25 }
26