tests: Test line number in debuginfo for diverging function calls

src/tools/compiletest/src/runtest.rs

@@ -2050,7 +2050,7 @@ impl<'test> TestCx<'test> {
         filecheck.arg("--allow-unused-prefixes");
 
         // Provide more context on failures.
-        filecheck.args(&["--dump-input-context", "100"]);
+        filecheck.args(&["--dump-input-context", "1000000"]);
 
         // Add custom flags supplied by the `filecheck-flags:` test directive.
         filecheck.args(&self.props.filecheck_flags);

tests/codegen/diverging-function-call-debuginfo.rs

@@ -0,0 +1,33 @@
+/// Make sure that line debuginfo is correct for diverging calls under certain
+/// conditions. In particular we want to ensure that the line number is never
+/// 0, but we check the absence of 0 by looking for the expected exact line
+/// numbers. Regression test for <https://github.com/rust-lang/rust/issues/59558>.
+
+//@ compile-flags: -g -Clto -Copt-level=0
+//@ no-prefer-dynamic
+
+fn main() {
+    if True == False {
+        // unreachable
+        // CHECK-DAG: [[UNREACHABLE_CALL_DBG:![0-9]+]] = !DILocation(line: [[@LINE+1]], column: 9, scope:
+        diverge();
+    }
+
+    // CHECK-DAG: [[LAST_CALL_DBG:![0-9]+]] = !DILocation(line: [[@LINE+1]], column: 5, scope:
+    diverge();
+}
+
+#[derive(PartialEq)]
+pub enum MyBool {
+    True,
+    False,
+}
+
+use MyBool::*;
+
+fn diverge() -> ! {
+    panic!();
+}
+
+// CHECK-DAG: call void {{.*}}diverging_function_call_debuginfo{{.*}}diverge{{.*}} !dbg [[LAST_CALL_DBG]]
+// CHECK-DAG: call void {{.*}}diverging_function_call_debuginfo{{.*}}diverge{{.*}} !dbg [[UNREACHABLE_CALL_DBG]]