| // rust-lang/rust#45696: This test checks the compiler won't infinite |
| // loop when you declare a variable of type `struct A(Box<A>, ...);` |
| // (which is impossible to construct but *is* possible to declare; see |
| // also issues #4287, #44933, and #52852). |
| // |
| // We will explicitly test AST-borrowck, NLL, and migration modes; |
| // thus we will also skip the automated compare-mode=nll. |
| |
| // revisions: ast nll migrate |
| // ignore-compare-mode-nll |
| |
| #![cfg_attr(nll, feature(nll))] |
| //[migrate]compile-flags: -Z borrowck=migrate -Z two-phase-borrows |
| |
| // run-pass |
| |
| // This test has structs and functions that are by definition unusable |
| // all over the place, so just go ahead and allow dead_code |
| #![allow(dead_code)] |
| |
| // direct regular recursion with indirect ownership via box |
| struct C { field: Box<C> } |
| |
| // direct non-regular recursion with indirect ownership via box |
| struct D { field: Box<(D, D)> } |
| |
| // indirect regular recursion with indirect ownership via box. |
| struct E { field: F } |
| struct F { field: Box<E> } |
| |
| // indirect non-regular recursion with indirect ownership via box. |
| struct G { field: (H, H) } |
| struct H { field: Box<G> } |
| |
| // These enums are cases that are not currently hit by the |
| // `visit_terminator_drop` recursion down a type's structural |
| // definition. |
| // |
| // But it seems prudent to include them in this test as variants on |
| // the above, in that they are similarly non-constructable data types |
| // with destructors that would diverge. |
| enum I { One(Box<I>) } |
| enum J { One(Box<J>), Two(Box<J>) } |
| |
| fn impossible_to_call_c(_c: C) { } |
| fn impossible_to_call_d(_d: D) { } |
| fn impossible_to_call_e(_e: E) { } |
| fn impossible_to_call_f(_f: F) { } |
| fn impossible_to_call_g(_g: G) { } |
| fn impossible_to_call_h(_h: H) { } |
| fn impossible_to_call_i(_i: I) { } |
| fn impossible_to_call_j(_j: J) { } |
| |
| fn main() { |
| |
| } |
