X-Git-Url: https://git.lizzy.rs/?a=blobdiff_plain;f=compiler%2Frustc_parse%2Fsrc%2Flib.rs;h=0becdf24c532be6ab438641ba27847f884004688;hb=dd33766e4a9a918058c3447d42491e874e21f7cc;hp=dedb9850b5a19f75a160250f5ea4615585511abe;hpb=04b72b469781b811655b0d5eb7d4c3c53fe1241d;p=rust.git

diff --git a/compiler/rustc_parse/src/lib.rs b/compiler/rustc_parse/src/lib.rs
index dedb9850b5a..0becdf24c53 100644
--- a/compiler/rustc_parse/src/lib.rs
+++ b/compiler/rustc_parse/src/lib.rs
@@ -364,6 +364,12 @@ fn semantic_tree(tree: &TokenTree) -> bool {
                 | token::CloseDelim(DelimToken::NoDelim)
                 // The pretty printer collapses many semicolons into one.
                 | token::Semi
+                // We don't preserve leading `|` tokens in patterns, so
+                // we ignore them entirely
+                | token::BinOp(token::BinOpToken::Or)
+                // We don't preserve trailing '+' tokens in trait bounds,
+                // so we ignore them entirely
+                | token::BinOp(token::BinOpToken::Plus)
                 // The pretty printer can turn `$crate` into `::crate_name`
                 | token::ModSep = token.kind {
                 return false;