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HIR: explain in comment why ExprKind::If "then" is an Expr #141059

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HIR: explain in comment why ExprKind::If "then" is an Expr #141059

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2 changes: 2 additions & 0 deletions compiler/rustc_hir/src/hir.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2744,6 +2744,8 @@ pub enum ExprKind<'hir> {
///
/// The "then" expr is always `ExprKind::Block`. If present, the "else" expr is always
/// `ExprKind::Block` (for `else`) or `ExprKind::If` (for `else if`).
/// Note that using an `Expr` instead of a `Block` for the "then" part is intentional,
/// as it simplifies the type coercion machinery.
If(&'hir Expr<'hir>, &'hir Expr<'hir>, Option<&'hir Expr<'hir>>),
/// A conditionless loop (can be exited with `break`, `continue`, or `return`).
///
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