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Handle pretty printing of else if let clauses

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Closes #84434. Closes #82329.
This commit is contained in:
Smitty 2021-04-23 13:29:18 -04:00
parent 6df26f897c
commit e4ce655cbf
1 changed files with 22 additions and 2 deletions
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24
compiler/rustc_hir_pretty/src/lib.rs
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@ -1095,8 +1095,8 @@ impl<'a> State<'a> {
fn print_else(&mut self, els: Option<&hir::Expr<'_>>) {
match els {
Some(_else) => {
match _else.kind {
Some(else_) => {
match else_.kind {
// "another else-if"
hir::ExprKind::If(ref i, ref then, ref e) => {
self.cbox(INDENT_UNIT - 1);
@ -1114,6 +1114,26 @@ impl<'a> State<'a> {
self.s.word(" else ");
self.print_block(&b)
}
hir::ExprKind::Match(ref expr, arms, _) => {
// else if let desugared to match
assert!(arms.len() == 2, "if let desugars to match with two arms");
self.s.word(" else ");
self.s.word("{");
self.cbox(INDENT_UNIT);
self.ibox(INDENT_UNIT);
self.word_nbsp("match");
self.print_expr_as_cond(&expr);
self.s.space();
self.bopen();
for arm in arms {
self.print_arm(arm);
}
self.bclose(expr.span);
self.s.word("}");
}
// BLEAH, constraints would be great here
_ => {
panic!("print_if saw if with weird alternative");