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+error: invalid `?` in type
+ --> $DIR/issue-103748-ICE-wrong-braces.rs:3:36
+ |
+LL | struct Apple((Apple, Option(Banana ? Citron)));
+ | ^ `?` is only allowed on expressions, not types
+ |
+help: if you meant to express that the type might not contain a value, use the `Option` wrapper type
+ |
+LL | struct Apple((Apple, Option(Option<Banana > Citron)));
+ | +++++++ ~
+
+error: expected one of `)` or `,`, found `Citron`
+ --> $DIR/issue-103748-ICE-wrong-braces.rs:3:38
+ |
+LL | struct Apple((Apple, Option(Banana ? Citron)));
+ | -^^^^^^ expected one of `)` or `,`
+ | |
+ | help: missing `,`
+
+error[E0412]: cannot find type `Citron` in this scope
+ --> $DIR/issue-103748-ICE-wrong-braces.rs:3:38
+ |
+LL | struct Apple((Apple, Option(Banana ? Citron)));
+ | ^^^^^^ not found in this scope
+
+error[E0214]: parenthesized type parameters may only be used with a `Fn` trait
+ --> $DIR/issue-103748-ICE-wrong-braces.rs:3:22
+ |
+LL | struct Apple((Apple, Option(Banana ? Citron)));
+ | ^^^^^^^^^^^^^^^^^^^^^^^ only `Fn` traits may use parentheses
+ |
+help: use angle brackets instead
+ |
+LL | struct Apple((Apple, Option<Banana ? Citron>));
+ | ~ ~
+
+error[E0072]: recursive type `Apple` has infinite size
+ --> $DIR/issue-103748-ICE-wrong-braces.rs:3:1
+ |
+LL | struct Apple((Apple, Option(Banana ? Citron)));
+ | ^^^^^^^^^^^^ ----- recursive without indirection
+ |
+help: insert some indirection (e.g., a `Box`, `Rc`, or `&`) to break the cycle
+ |
+LL | struct Apple((Box<Apple>, Option(Banana ? Citron)));
+ | ++++ +
+
+error: aborting due to 5 previous errors
+
+Some errors have detailed explanations: E0072, E0214, E0412.
+For more information about an error, try `rustc --explain E0072`.