2 files changed, 3 insertions, 13 deletions
diff --git a/src/doc/book/listings/ch15-smart-pointers/listing-15-03/output.txt b/src/doc/book/listings/ch15-smart-pointers/listing-15-03/output.txt
index 437d74b5c..d5522cd53 100644
--- a/src/doc/book/listings/ch15-smart-pointers/listing-15-03/output.txt
+++ b/src/doc/book/listings/ch15-smart-pointers/listing-15-03/output.txt
@@ -13,15 +13,5 @@ help: insert some indirection (e.g., a `Box`, `Rc`, or `&`) to make `List` repre
 2 |     Cons(i32, Box<List>),
   |               ++++    +
 
-error[E0391]: cycle detected when computing drop-check constraints for `List`
- --> src/main.rs:1:1
-  |
-1 | enum List {
-  | ^^^^^^^^^
-  |
-  = note: ...which immediately requires computing drop-check constraints for `List` again
-  = note: cycle used when computing dropck types for `Canonical { max_universe: U0, variables: [], value: ParamEnvAnd { param_env: ParamEnv { caller_bounds: [], reveal: UserFacing, constness: NotConst }, value: List } }`
-
-Some errors have detailed explanations: E0072, E0391.
-For more information about an error, try `rustc --explain E0072`.
-error: could not compile `cons-list` due to 2 previous errors
+For more information about this error, try `rustc --explain E0072`.
+error: could not compile `cons-list` due to previous error
diff --git a/src/doc/book/listings/ch15-smart-pointers/listing-15-23/output.txt b/src/doc/book/listings/ch15-smart-pointers/listing-15-23/output.txt
index c44e69f13..3749c845c 100644
--- a/src/doc/book/listings/ch15-smart-pointers/listing-15-23/output.txt
+++ b/src/doc/book/listings/ch15-smart-pointers/listing-15-23/output.txt
@@ -18,4 +18,4 @@ failures:
 
 test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
 
-error: test failed, to rerun pass '--lib'
+error: test failed, to rerun pass `--lib`