Rollup merge of #92802 - compiler-errors:deduplicate-stack-trace, r=oli-obk

Deduplicate lines in long const-eval stack trace

Lemme know if this is kinda overkill, lol.

Fixes #92796

2 files changed, 42 insertions, 0 deletions

diff --git a/src/test/ui/consts/recursive.rs b/src/test/ui/consts/recursive.rs
new file mode 100644
index 00000000000..664940c52cf
--- /dev/null
+++ b/src/test/ui/consts/recursive.rs
@@ -0,0 +1,11 @@
+#![allow(unused)]
+
+const fn f<T>(x: T) { //~ WARN function cannot return without recursing
+    f(x);
+    //~^ ERROR any use of this value will cause an error
+    //~| WARN this was previously accepted by the compiler
+}
+
+const X: () = f(1);
+
+fn main() {}
diff --git a/src/test/ui/consts/recursive.stderr b/src/test/ui/consts/recursive.stderr
new file mode 100644
index 00000000000..31ac1fff4e8
--- /dev/null
+++ b/src/test/ui/consts/recursive.stderr
@@ -0,0 +1,31 @@
+warning: function cannot return without recursing
+  --> $DIR/recursive.rs:3:1
+   |
+LL | const fn f<T>(x: T) {
+   | ^^^^^^^^^^^^^^^^^^^ cannot return without recursing
+LL |     f(x);
+   |     ---- recursive call site
+   |
+   = note: `#[warn(unconditional_recursion)]` on by default
+   = help: a `loop` may express intention better if this is on purpose
+
+error: any use of this value will cause an error
+  --> $DIR/recursive.rs:4:5
+   |
+LL |     f(x);
+   |     ^^^^
+   |     |
+   |     reached the configured maximum number of stack frames
+   |     inside `f::<i32>` at $DIR/recursive.rs:4:5
+   |     [... 126 additional calls inside `f::<i32>` at $DIR/recursive.rs:4:5 ...]
+   |     inside `X` at $DIR/recursive.rs:9:15
+...
+LL | const X: () = f(1);
+   | -------------------
+   |
+   = note: `#[deny(const_err)]` on by default
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #71800 <https://github.com/rust-lang/rust/issues/71800>
+
+error: aborting due to previous error; 1 warning emitted
+