Remove 'this error originates in format_args_nl' from test output.

m-ou-se · m-ou-se · commit 28090bcf05c9 · 2025-05-07T18:00:09.000+02:00
This message is no longer generated.

This is probably a good thing. The relevant span is entirely in user
code, and "format_args_nl" is an implementation detail with a name that
isn't even public.
diff --git a/tests/ui/borrowck/borrowck-and-init.stderr b/tests/ui/borrowck/borrowck-and-init.stderr
@@ -8,8 +8,6 @@ LL |     println!("{}", false && { i = 5; true });
    |                               ----- binding initialized here in some conditions
 LL |     println!("{}", i);
    |                    ^ `i` used here but it is possibly-uninitialized
-   |
-   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/borrowck/borrowck-break-uninit-2.stderr b/tests/ui/borrowck/borrowck-break-uninit-2.stderr
@@ -7,7 +7,6 @@ LL |     let x: isize;
 LL |     println!("{}", x);
    |                    ^ `x` used here but it isn't initialized
    |
-   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 help: consider assigning a value
    |
 LL |     let x: isize = 42;
diff --git a/tests/ui/borrowck/borrowck-break-uninit.stderr b/tests/ui/borrowck/borrowck-break-uninit.stderr
@@ -7,7 +7,6 @@ LL |     let x: isize;
 LL |     println!("{}", x);
    |                    ^ `x` used here but it isn't initialized
    |
-   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 help: consider assigning a value
    |
 LL |     let x: isize = 42;
diff --git a/tests/ui/borrowck/borrowck-or-init.stderr b/tests/ui/borrowck/borrowck-or-init.stderr
@@ -8,8 +8,6 @@ LL |     println!("{}", false || { i = 5; true });
    |                               ----- binding initialized here in some conditions
 LL |     println!("{}", i);
    |                    ^ `i` used here but it is possibly-uninitialized
-   |
-   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/borrowck/borrowck-while-break.stderr b/tests/ui/borrowck/borrowck-while-break.stderr
@@ -8,8 +8,6 @@ LL |     while cond {
 ...
 LL |     println!("{}", v);
    |                    ^ `v` used here but it is possibly-uninitialized
-   |
-   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/borrowck/issue-24267-flow-exit.stderr b/tests/ui/borrowck/issue-24267-flow-exit.stderr
@@ -7,7 +7,6 @@ LL |     loop { x = break; }
 LL |     println!("{}", x);
    |                    ^ `x` used here but it isn't initialized
    |
-   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 help: consider assigning a value
    |
 LL |     let x: i32 = 42;
@@ -22,7 +21,6 @@ LL |     for _ in 0..10 { x = continue; }
 LL |     println!("{}", x);
    |                    ^ `x` used here but it isn't initialized
    |
-   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 help: consider assigning a value
    |
 LL |     let x: i32 = 42;
diff --git a/tests/ui/borrowck/issue-47646.stderr b/tests/ui/borrowck/issue-47646.stderr
@@ -12,8 +12,6 @@ LL |             println!("{:?}", heap);
 ...
 LL |     };
    |      - ... and the mutable borrow might be used here, when that temporary is dropped and runs the destructor for type `(Option<PeekMut<'_, i32>>, ())`
-   |
-   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/borrowck/suggest-assign-rvalue.stderr b/tests/ui/borrowck/suggest-assign-rvalue.stderr
@@ -19,7 +19,6 @@ LL |     let my_float: f32;
 LL |     println!("my_float: {}", my_float);
    |                              ^^^^^^^^ `my_float` used here but it isn't initialized
    |
-   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 help: consider assigning a value
    |
 LL |     let my_float: f32 = 3.14159;
@@ -33,7 +32,6 @@ LL |     let demo: Demo;
 LL |     println!("demo: {:?}", demo);
    |                            ^^^^ `demo` used here but it isn't initialized
    |
-   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 help: consider assigning a value
    |
 LL |     let demo: Demo = Default::default();
@@ -47,7 +45,6 @@ LL |     let demo_no: DemoNoDef;
 LL |     println!("demo_no: {:?}", demo_no);
    |                               ^^^^^^^ `demo_no` used here but it isn't initialized
    |
-   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 help: consider assigning a value
    |
 LL |     let demo_no: DemoNoDef = /* value */;
@@ -61,7 +58,6 @@ LL |     let arr: [i32; 5];
 LL |     println!("arr: {:?}", arr);
    |                           ^^^ `arr` used here but it isn't initialized
    |
-   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 help: consider assigning a value
    |
 LL |     let arr: [i32; 5] = [42; 5];
@@ -75,7 +71,6 @@ LL |     let foo: Vec<&str>;
 LL |     println!("foo: {:?}", foo);
    |                           ^^^ `foo` used here but it isn't initialized
    |
-   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 help: consider assigning a value
    |
 LL |     let foo: Vec<&str> = vec![];
@@ -89,7 +84,6 @@ LL |     let my_string: String;
 LL |     println!("my_string: {}", my_string);
    |                               ^^^^^^^^^ `my_string` used here but it isn't initialized
    |
-   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 help: consider assigning a value
    |
 LL |     let my_string: String = Default::default();
@@ -103,7 +97,6 @@ LL |     let my_int: &i32;
 LL |     println!("my_int: {}", *my_int);
    |                            ^^^^^^^ `*my_int` used here but it isn't initialized
    |
-   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 help: consider assigning a value
    |
 LL |     let my_int: &i32 = &42;
@@ -117,7 +110,6 @@ LL |     let hello: &str;
 LL |     println!("hello: {}", hello);
    |                           ^^^^^ `hello` used here but it isn't initialized
    |
-   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 help: consider assigning a value
    |
 LL |     let hello: &str = "";
@@ -130,8 +122,6 @@ LL |     let never: !;
    |         ----- binding declared here but left uninitialized
 LL |     println!("never: {}", never);
    |                           ^^^^^ `never` used here but it isn't initialized
-   |
-   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to 10 previous errors
 
diff --git a/tests/ui/closures/2229_closure_analysis/diagnostics/arrays.stderr b/tests/ui/closures/2229_closure_analysis/diagnostics/arrays.stderr
@@ -53,8 +53,6 @@ LL |     println!("{}", arr[3]);
 ...
 LL |     c();
    |     - mutable borrow later used here
-   |
-   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0502]: cannot borrow `arr` as immutable because it is also borrowed as mutable
   --> $DIR/arrays.rs:71:24
diff --git a/tests/ui/closures/2229_closure_analysis/diagnostics/box.stderr b/tests/ui/closures/2229_closure_analysis/diagnostics/box.stderr
@@ -25,8 +25,6 @@ LL |     println!("{}", e.0.0.m.x);
 LL |
 LL |     c();
    |     - mutable borrow later used here
-   |
-   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0506]: cannot assign to `e.0.0.m.x` because it is borrowed
   --> $DIR/box.rs:55:5
diff --git a/tests/ui/closures/2229_closure_analysis/diagnostics/repr_packed.stderr b/tests/ui/closures/2229_closure_analysis/diagnostics/repr_packed.stderr
@@ -7,7 +7,6 @@ LL |         println!("{}", foo.x);
    = note: packed structs are only aligned by one byte, and many modern architectures penalize unaligned field accesses
    = note: creating a misaligned reference is undefined behavior (even if that reference is never dereferenced)
    = help: copy the field contents to a local variable, or replace the reference with a raw pointer and use `read_unaligned`/`write_unaligned` (loads and stores via `*p` must be properly aligned even when using raw pointers)
-   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/closures/2229_closure_analysis/diagnostics/simple-struct-min-capture.stderr b/tests/ui/closures/2229_closure_analysis/diagnostics/simple-struct-min-capture.stderr
@@ -13,8 +13,6 @@ LL |     println!("{:?}", p);
 LL |
 LL |     c();
    |     - mutable borrow later used here
-   |
-   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/closures/issue-111932.stderr b/tests/ui/closures/issue-111932.stderr
@@ -19,7 +19,6 @@ LL |         println!("{:?}", foo);
    = help: the trait `Sized` is not implemented for `dyn Foo`
 note: required by an implicit `Sized` bound in `core::fmt::rt::Argument::<'_>::new_debug`
   --> $SRC_DIR/core/src/fmt/rt.rs:LL:COL
-   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/codemap_tests/tab_3.stderr b/tests/ui/codemap_tests/tab_3.stderr
@@ -11,7 +11,6 @@ LL |         println!("{:?}", some_vec);
    |
 note: `into_iter` takes ownership of the receiver `self`, which moves `some_vec`
   --> $SRC_DIR/core/src/iter/traits/collect.rs:LL:COL
-   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 help: you can `clone` the value and consume it, but this might not be your desired behavior
    |
 LL |     some_vec.clone().into_iter();
diff --git a/tests/ui/consts/const-eval/issue-44578.stderr b/tests/ui/consts/const-eval/issue-44578.stderr
@@ -24,7 +24,7 @@ note: erroneous constant encountered
 LL |     println!("{}", <Bar<u16, u8> as Foo>::AMT);
    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = note: this note originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
+   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
 note: erroneous constant encountered
   --> $DIR/issue-44578.rs:26:20
@@ -33,7 +33,6 @@ LL |     println!("{}", <Bar<u16, u8> as Foo>::AMT);
    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
-   = note: this note originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/coroutine/yield-while-ref-reborrowed.stderr b/tests/ui/coroutine/yield-while-ref-reborrowed.stderr
@@ -10,8 +10,6 @@ LL |     println!("{}", x);
    |                    ^ second borrow occurs here
 LL |     Pin::new(&mut b).resume(());
    |              ------ first borrow later used here
-   |
-   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/fmt/ifmt-unimpl.stderr b/tests/ui/fmt/ifmt-unimpl.stderr
@@ -19,7 +19,6 @@ LL |     format!("{:X}", "3");
    = note: required for `&str` to implement `UpperHex`
 note: required by a bound in `core::fmt::rt::Argument::<'_>::new_upper_hex`
   --> $SRC_DIR/core/src/fmt/rt.rs:LL:COL
-   = note: this error originates in the macro `$crate::__export::format_args` which comes from the expansion of the macro `format` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/inference/need_type_info/issue-107745-avoid-expr-from-macro-expansion.stderr b/tests/ui/inference/need_type_info/issue-107745-avoid-expr-from-macro-expansion.stderr
@@ -3,8 +3,6 @@ error[E0282]: type annotations needed
    |
 LL |     println!("{:?}", []);
    |                      ^^ cannot infer type
-   |
-   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/issues/issue-42796.stderr b/tests/ui/issues/issue-42796.stderr
@@ -9,7 +9,6 @@ LL |     let mut s_copy = s;
 LL |     println!("{}", s);
    |                    ^ value borrowed here after move
    |
-   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 help: consider cloning the value if the performance cost is acceptable
    |
 LL |     let mut s_copy = s.clone();
diff --git a/tests/ui/liveness/liveness-move-in-while.stderr b/tests/ui/liveness/liveness-move-in-while.stderr
@@ -35,7 +35,6 @@ LL |         while true { while true { while true { x = y; x.clone(); } } }
    |         |            inside of this loop
    |         inside of this loop
    |
-   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 help: consider cloning the value if the performance cost is acceptable
    |
 LL |         while true { while true { while true { x = y.clone(); x.clone(); } } }
diff --git a/tests/ui/liveness/liveness-use-after-move.stderr b/tests/ui/liveness/liveness-use-after-move.stderr
@@ -9,7 +9,6 @@ LL |
 LL |     println!("{}", *x);
    |                    ^^ value borrowed here after move
    |
-   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 help: consider cloning the value if the performance cost is acceptable
    |
 LL |     let y = x.clone();
diff --git a/tests/ui/liveness/liveness-use-after-send.stderr b/tests/ui/liveness/liveness-use-after-send.stderr
@@ -13,7 +13,6 @@ note: consider changing this parameter type in function `send` to borrow instead
    |
 LL | fn send<T:Send + std::fmt::Debug>(ch: Chan<T>, data: T) {
    |    ---- in this function                             ^ this parameter takes ownership of the value
-   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 help: consider cloning the value if the performance cost is acceptable
    |
 LL |     send(ch, message.clone());
diff --git a/tests/ui/loops/loop-proper-liveness.stderr b/tests/ui/loops/loop-proper-liveness.stderr
@@ -7,7 +7,6 @@ LL |     let x: i32;
 LL |     println!("{:?}", x);
    |                      ^ `x` used here but it isn't initialized
    |
-   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 help: consider assigning a value
    |
 LL |     let x: i32 = 42;
diff --git a/tests/ui/macros/format-args-temporaries-in-write.stderr b/tests/ui/macros/format-args-temporaries-in-write.stderr
@@ -13,7 +13,6 @@ LL |     };
    |     -- ... and the borrow might be used here, when that temporary is dropped and runs the `Drop` code for type `MutexGuard`
    |     |
    |     `mutex` dropped here while still borrowed
-   |
 
 error[E0597]: `mutex` does not live long enough
   --> $DIR/format-args-temporaries-in-write.rs:47:29
@@ -30,7 +29,6 @@ LL |     };
    |     -- ... and the borrow might be used here, when that temporary is dropped and runs the `Drop` code for type `MutexGuard`
    |     |
    |     `mutex` dropped here while still borrowed
-   |
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/modules/issue-107649.stderr b/tests/ui/modules/issue-107649.stderr
@@ -6,7 +6,7 @@ error[E0277]: `Dummy` doesn't implement `Debug`
     |
     = help: the trait `Debug` is not implemented for `Dummy`
     = note: add `#[derive(Debug)]` to `Dummy` or manually `impl Debug for Dummy`
-    = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `dbg` (in Nightly builds, run with -Z macro-backtrace for more info)
+    = note: this error originates in the macro `dbg` (in Nightly builds, run with -Z macro-backtrace for more info)
 help: consider annotating `Dummy` with `#[derive(Debug)]`
    --> $DIR/auxiliary/dummy_lib.rs:2:1
     |
diff --git a/tests/ui/moves/moves-based-on-type-capture-clause-bad.stderr b/tests/ui/moves/moves-based-on-type-capture-clause-bad.stderr
@@ -10,8 +10,6 @@ LL |         println!("{}", x);
 LL |     });
 LL |     println!("{}", x);
    |                    ^ value borrowed here after move
-   |
-   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/rfcs/rfc-2361-dbg-macro/dbg-macro-requires-debug.stderr b/tests/ui/rfcs/rfc-2361-dbg-macro/dbg-macro-requires-debug.stderr
@@ -6,7 +6,7 @@ LL |     let _: NotDebug = dbg!(NotDebug);
    |
    = help: the trait `Debug` is not implemented for `NotDebug`
    = note: add `#[derive(Debug)]` to `NotDebug` or manually `impl Debug for NotDebug`
-   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `dbg` (in Nightly builds, run with -Z macro-backtrace for more info)
+   = note: this error originates in the macro `dbg` (in Nightly builds, run with -Z macro-backtrace for more info)
 help: consider annotating `NotDebug` with `#[derive(Debug)]`
    |
 LL + #[derive(Debug)]
diff --git a/tests/ui/span/issue-39698.stderr b/tests/ui/span/issue-39698.stderr
@@ -47,8 +47,6 @@ LL |         T::T1(a, d) | T::T2(d, b) | T::T3(c) | T::T4(a) => { println!("{:?}
    |               |                                      binding initialized here in some conditions
    |               binding initialized here in some conditions
    |               binding declared here but left uninitialized
-   |
-   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to 5 previous errors
 
diff --git a/tests/ui/suggestions/bound-suggestions.stderr b/tests/ui/suggestions/bound-suggestions.stderr
diff --git a/tests/ui/suggestions/issue-97760.stderr b/tests/ui/suggestions/issue-97760.stderr
diff --git a/tests/ui/suggestions/path-display.stderr b/tests/ui/suggestions/path-display.stderr
diff --git a/tests/ui/try-block/try-block-maybe-bad-lifetime.stderr b/tests/ui/try-block/try-block-maybe-bad-lifetime.stderr
diff --git a/tests/ui/type-alias-impl-trait/nested.stderr b/tests/ui/type-alias-impl-trait/nested.stderr
diff --git a/tests/ui/type/binding-assigned-block-without-tail-expression.stderr b/tests/ui/type/binding-assigned-block-without-tail-expression.stderr
diff --git a/tests/ui/use/use-after-move-based-on-type.stderr b/tests/ui/use/use-after-move-based-on-type.stderr
diff --git a/tests/ui/walk-struct-literal-with.stderr b/tests/ui/walk-struct-literal-with.stderr

Original file line number	Diff line number	Diff line change
`@@ -7,7 +7,6 @@ LL \| let x: isize;`
`7`	`7`	`LL \| println!("{}", x);`
`8`	`8`	\| ^ `x` used here but it isn't initialized
`9`	`9`	`\|`
`10`		- = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
`11`	`10`	`help: consider assigning a value`
`12`	`11`	`\|`
`13`	`12`	`LL \| let x: isize = 42;`
Original file line number	Diff line number	Diff line change
`@@ -7,7 +7,6 @@ LL \| loop { x = break; }`
`7`	`7`	`LL \| println!("{}", x);`
`8`	`8`	\| ^ `x` used here but it isn't initialized
`9`	`9`	`\|`
`10`		- = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
`11`	`10`	`help: consider assigning a value`
`12`	`11`	`\|`
`13`	`12`	`LL \| let x: i32 = 42;`
`@@ -22,7 +21,6 @@ LL \| for _ in 0..10 { x = continue; }`
`22`	`21`	`LL \| println!("{}", x);`
`23`	`22`	\| ^ `x` used here but it isn't initialized
`24`	`23`	`\|`
`25`		- = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
`26`	`24`	`help: consider assigning a value`
`27`	`25`	`\|`
`28`	`26`	`LL \| let x: i32 = 42;`
Original file line number	Diff line number	Diff line change
`@@ -19,7 +19,6 @@ LL \| let my_float: f32;`
`19`	`19`	`LL \| println!("my_float: {}", my_float);`
`20`	`20`	\| ^^^^^^^^ `my_float` used here but it isn't initialized
`21`	`21`	`\|`
`22`		- = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
`23`	`22`	`help: consider assigning a value`
`24`	`23`	`\|`
`25`	`24`	`LL \| let my_float: f32 = 3.14159;`
`@@ -33,7 +32,6 @@ LL \| let demo: Demo;`
`33`	`32`	`LL \| println!("demo: {:?}", demo);`
`34`	`33`	\| ^^^^ `demo` used here but it isn't initialized
`35`	`34`	`\|`
`36`		- = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
`37`	`35`	`help: consider assigning a value`
`38`	`36`	`\|`
`39`	`37`	`LL \| let demo: Demo = Default::default();`
`@@ -47,7 +45,6 @@ LL \| let demo_no: DemoNoDef;`
`47`	`45`	`LL \| println!("demo_no: {:?}", demo_no);`
`48`	`46`	\| ^^^^^^^ `demo_no` used here but it isn't initialized
`49`	`47`	`\|`
`50`		- = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
`51`	`48`	`help: consider assigning a value`
`52`	`49`	`\|`
`53`	`50`	`LL \| let demo_no: DemoNoDef = /* value */;`
`@@ -61,7 +58,6 @@ LL \| let arr: [i32; 5];`
`61`	`58`	`LL \| println!("arr: {:?}", arr);`
`62`	`59`	\| ^^^ `arr` used here but it isn't initialized
`63`	`60`	`\|`
`64`		- = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
`65`	`61`	`help: consider assigning a value`
`66`	`62`	`\|`
`67`	`63`	`LL \| let arr: [i32; 5] = [42; 5];`
`@@ -75,7 +71,6 @@ LL \| let foo: Vec<&str>;`
`75`	`71`	`LL \| println!("foo: {:?}", foo);`
`76`	`72`	\| ^^^ `foo` used here but it isn't initialized
`77`	`73`	`\|`
`78`		- = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
`79`	`74`	`help: consider assigning a value`
`80`	`75`	`\|`
`81`	`76`	`LL \| let foo: Vec<&str> = vec![];`
`@@ -89,7 +84,6 @@ LL \| let my_string: String;`
`89`	`84`	`LL \| println!("my_string: {}", my_string);`
`90`	`85`	\| ^^^^^^^^^ `my_string` used here but it isn't initialized
`91`	`86`	`\|`
`92`		- = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
`93`	`87`	`help: consider assigning a value`
`94`	`88`	`\|`
`95`	`89`	`LL \| let my_string: String = Default::default();`
`@@ -103,7 +97,6 @@ LL \| let my_int: &i32;`
`103`	`97`	`LL \| println!("my_int: {}", *my_int);`
`104`	`98`	\| ^^^^^^^ `*my_int` used here but it isn't initialized
`105`	`99`	`\|`
`106`		- = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
`107`	`100`	`help: consider assigning a value`
`108`	`101`	`\|`
`109`	`102`	`LL \| let my_int: &i32 = &42;`
`@@ -117,7 +110,6 @@ LL \| let hello: &str;`
`117`	`110`	`LL \| println!("hello: {}", hello);`
`118`	`111`	\| ^^^^^ `hello` used here but it isn't initialized
`119`	`112`	`\|`
`120`		- = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
`121`	`113`	`help: consider assigning a value`
`122`	`114`	`\|`
`123`	`115`	`LL \| let hello: &str = "";`
`@@ -130,8 +122,6 @@ LL \| let never: !;`
`130`	`122`	`\| ----- binding declared here but left uninitialized`
`131`	`123`	`LL \| println!("never: {}", never);`
`132`	`124`	\| ^^^^^ `never` used here but it isn't initialized
`133`		`- \|`
`134`		- = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
`135`	`125`
`136`	`126`	`error: aborting due to 10 previous errors`
`137`	`127`
Original file line number	Diff line number	Diff line change
`@@ -11,7 +11,6 @@ LL \| println!("{:?}", some_vec);`
`11`	`11`	`\|`
`12`	`12`	note: `into_iter` takes ownership of the receiver `self`, which moves `some_vec`
`13`	`13`	`--> $SRC_DIR/core/src/iter/traits/collect.rs:LL:COL`
`14`		- = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
`15`	`14`	help: you can `clone` the value and consume it, but this might not be your desired behavior
`16`	`15`	`\|`
`17`	`16`	`LL \| some_vec.clone().into_iter();`
Original file line number	Diff line number	Diff line change
`@@ -24,7 +24,7 @@ note: erroneous constant encountered`
`24`	`24`	`LL \| println!("{}", <Bar<u16, u8> as Foo>::AMT);`
`25`	`25`	`\| ^^^^^^^^^^^^^^^^^^^^^^^^^^`
`26`	`26`	`\|`
`27`		- = note: this note originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
	`27`	+ = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
`28`	`28`
`29`	`29`	`note: erroneous constant encountered`
`30`	`30`	`--> $DIR/issue-44578.rs:26:20`
`@@ -33,7 +33,6 @@ LL \| println!("{}", <Bar<u16, u8> as Foo>::AMT);`
`33`	`33`	`\| ^^^^^^^^^^^^^^^^^^^^^^^^^^`
`34`	`34`	`\|`
`35`	`35`	= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
`36`		- = note: this note originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
`37`	`36`
`38`	`37`	`error: aborting due to 1 previous error`
`39`	`38`
Original file line number	Diff line number	Diff line change
`@@ -3,8 +3,6 @@ error[E0282]: type annotations needed`
`3`	`3`	`\|`
`4`	`4`	`LL \| println!("{:?}", []);`
`5`	`5`	`\| ^^ cannot infer type`
`6`		`- \|`
`7`		- = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
`8`	`6`
`9`	`7`	`error: aborting due to 1 previous error`
`10`	`8`
Original file line number	Diff line number	Diff line change
`@@ -9,7 +9,6 @@ LL \| let mut s_copy = s;`
`9`	`9`	`LL \| println!("{}", s);`
`10`	`10`	`\| ^ value borrowed here after move`
`11`	`11`	`\|`
`12`		- = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
`13`	`12`	`help: consider cloning the value if the performance cost is acceptable`
`14`	`13`	`\|`
`15`	`14`	`LL \| let mut s_copy = s.clone();`
Original file line number	Diff line number	Diff line change
`@@ -35,7 +35,6 @@ LL \| while true { while true { while true { x = y; x.clone(); } } }`
`35`	`35`	`\| \| inside of this loop`
`36`	`36`	`\| inside of this loop`
`37`	`37`	`\|`
`38`		- = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
`39`	`38`	`help: consider cloning the value if the performance cost is acceptable`
`40`	`39`	`\|`
`41`	`40`	`LL \| while true { while true { while true { x = y.clone(); x.clone(); } } }`
Original file line number	Diff line number	Diff line change
`@@ -9,7 +9,6 @@ LL \|`
`9`	`9`	`LL \| println!("{}", *x);`
`10`	`10`	`\| ^^ value borrowed here after move`
`11`	`11`	`\|`
`12`		- = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
`13`	`12`	`help: consider cloning the value if the performance cost is acceptable`
`14`	`13`	`\|`
`15`	`14`	`LL \| let y = x.clone();`
Original file line number	Diff line number	Diff line change
@@ -13,7 +13,6 @@ note: consider changing this parameter type in function `send` to borrow instead
`13`	`13`	`\|`
`14`	`14`	`LL \| fn send<T:Send + std::fmt::Debug>(ch: Chan<T>, data: T) {`
`15`	`15`	`\| ---- in this function ^ this parameter takes ownership of the value`
`16`		- = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
`17`	`16`	`help: consider cloning the value if the performance cost is acceptable`
`18`	`17`	`\|`
`19`	`18`	`LL \| send(ch, message.clone());`