ICEs should print the top of the query stack

Author: hosseind75

compiler/rustc_driver/src/lib.rs

@@ -1211,12 +1211,7 @@ pub fn report_ice(info: &panic::PanicInfo<'_>, bug_report_url: &str) {
         handler.note_without_error(&note);
     }
 
-    // If backtraces are enabled, also print the query stack
-    let backtrace = env::var_os("RUST_BACKTRACE").map(|x| &x != "0").unwrap_or(false);
-
-    if backtrace {
-        TyCtxt::try_print_query_stack(&handler);
-    }
+    TyCtxt::try_print_query_stack(&handler, Some(2));
 
     #[cfg(windows)]
     unsafe {

compiler/rustc_middle/src/ty/query/plumbing.rs

@@ -124,7 +124,7 @@ impl<'tcx> TyCtxt<'tcx> {
         })
     }
 
-    pub fn try_print_query_stack(handler: &Handler) {
+    pub fn try_print_query_stack(handler: &Handler, num_frames: Option<usize>) {
         eprintln!("query stack during panic:");
 
         // Be careful reyling on global state here: this code is called from
@@ -138,6 +138,9 @@ impl<'tcx> TyCtxt<'tcx> {
                 let mut i = 0;
 
                 while let Some(query) = current_query {
+                    if i == num_frames.unwrap() {
+                        break;
+                    } 
                     let query_info =
                         if let Some(info) = query_map.as_ref().and_then(|map| map.get(&query)) {
                             info

src/tools/clippy/src/driver.rs

@@ -274,12 +274,7 @@ fn report_clippy_ice(info: &panic::PanicInfo<'_>, bug_report_url: &str) {
         handler.note_without_error(&note);
     }
 
-    // If backtraces are enabled, also print the query stack
-    let backtrace = env::var_os("RUST_BACKTRACE").map_or(false, |x| &x != "0");
-
-    if backtrace {
-        TyCtxt::try_print_query_stack(&handler);
-    }
+    TyCtxt::try_print_query_stack(&handler, Some(2));
 }
 
 fn toolchain_path(home: Option<String>, toolchain: Option<String>) -> Option<PathBuf> {