Do not suggest using -Zmacro-backtrace for builtin macros

estebank · estebank · commit c334c5a7086a · 2025-03-14T19:50:03.000Z
For macros that are implemented on the compiler, we do *not* mention the `-Zmacro-backtrace` flag. This includes `derive`s and standard macros.
diff --git a/tests/fail/alloc/alloc_error_handler_custom.stderr b/tests/fail/alloc/alloc_error_handler_custom.stderr
@@ -21,7 +21,6 @@ note: inside `miri_start`
    |
 LL |     handle_alloc_error(Layout::for_value(&0));
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   = note: this error originates in the attribute macro `alloc_error_handler` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to 1 previous error
 
diff --git a/tests/fail/erroneous_const.stderr b/tests/fail/erroneous_const.stderr
@@ -3,8 +3,6 @@ error[E0080]: evaluation of `PrintName::<i32>::VOID` failed
    |
 LL |     const VOID: ! = panic!();
    |                     ^^^^^^^^ evaluation panicked: explicit panic
-   |
-   = note: this error originates in the macro `$crate::panic::panic_2021` which comes from the expansion of the macro `panic` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 note: erroneous constant encountered
   --> tests/fail/erroneous_const.rs:LL:CC
diff --git a/tests/fail/panic/no_std.stderr b/tests/fail/panic/no_std.stderr
@@ -13,7 +13,6 @@ note: inside `miri_start`
    |
 LL |     panic!("blarg I am dead")
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
-   = note: this error originates in the macro `$crate::panic::panic_2021` which comes from the expansion of the macro `panic` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/tests/fail/panic/panic_abort1.stderr b/tests/fail/panic/panic_abort1.stderr
@@ -22,7 +22,6 @@ note: inside `main`
    |
 LL |     std::panic!("panicking from libstd");
    | ^
-   = note: this error originates in the macro `$crate::panic::panic_2021` which comes from the expansion of the macro `std::panic` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/tests/fail/panic/panic_abort2.stderr b/tests/fail/panic/panic_abort2.stderr
@@ -22,7 +22,6 @@ note: inside `main`
    |
 LL |     std::panic!("{}-panicking from libstd", 42);
    | ^
-   = note: this error originates in the macro `$crate::panic::panic_2021` which comes from the expansion of the macro `std::panic` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/tests/fail/panic/panic_abort3.stderr b/tests/fail/panic/panic_abort3.stderr
@@ -22,7 +22,6 @@ note: inside `main`
    |
 LL |     core::panic!("panicking from libcore");
    | ^
-   = note: this error originates in the macro `$crate::panic::panic_2021` which comes from the expansion of the macro `core::panic` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/tests/fail/panic/panic_abort4.stderr b/tests/fail/panic/panic_abort4.stderr
@@ -22,7 +22,6 @@ note: inside `main`
    |
 LL |     core::panic!("{}-panicking from libcore", 42);
    | ^
-   = note: this error originates in the macro `$crate::panic::panic_2021` which comes from the expansion of the macro `core::panic` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 

Original file line number	Diff line number	Diff line change
@@ -21,7 +21,6 @@ note: inside `miri_start`
`21`	`21`	`\|`
`22`	`22`	`LL \| handle_alloc_error(Layout::for_value(&0));`
`23`	`23`	`\| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^`
`24`		- = note: this error originates in the attribute macro `alloc_error_handler` (in Nightly builds, run with -Z macro-backtrace for more info)
`25`	`24`
`26`	`25`	`error: aborting due to 1 previous error`
`27`	`26`
Original file line number	Diff line number	Diff line change
@@ -3,8 +3,6 @@ error[E0080]: evaluation of `PrintName::<i32>::VOID` failed
`3`	`3`	`\|`
`4`	`4`	`LL \| const VOID: ! = panic!();`
`5`	`5`	`\| ^^^^^^^^ evaluation panicked: explicit panic`
`6`		`- \|`
`7`		- = note: this error originates in the macro `$crate::panic::panic_2021` which comes from the expansion of the macro `panic` (in Nightly builds, run with -Z macro-backtrace for more info)
`8`	`6`
`9`	`7`	`note: erroneous constant encountered`
`10`	`8`	`--> tests/fail/erroneous_const.rs:LL:CC`
Original file line number	Diff line number	Diff line change
@@ -13,7 +13,6 @@ note: inside `miri_start`
`13`	`13`	`\|`
`14`	`14`	`LL \| panic!("blarg I am dead")`
`15`	`15`	`\| ^^^^^^^^^^^^^^^^^^^^^^^^^`
`16`		- = note: this error originates in the macro `$crate::panic::panic_2021` which comes from the expansion of the macro `panic` (in Nightly builds, run with -Z macro-backtrace for more info)
`17`	`16`
`18`	`17`	note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
`19`	`18`
Original file line number	Diff line number	Diff line change
@@ -22,7 +22,6 @@ note: inside `main`
`22`	`22`	`\|`
`23`	`23`	`LL \| std::panic!("panicking from libstd");`
`24`	`24`	`\| ^`
`25`		- = note: this error originates in the macro `$crate::panic::panic_2021` which comes from the expansion of the macro `std::panic` (in Nightly builds, run with -Z macro-backtrace for more info)
`26`	`25`
`27`	`26`	note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
`28`	`27`