tests: Test line debuginfo for linebreaked function parameters

Author: Enselic

tests/codegen/fn-parameters-on-different-lines-debuginfo.rs

@@ -0,0 +1,22 @@
+//! Make sure that line debuginfo of function parameters are correct even if
+//! they are not on the same line. Regression test for
+// <https://github.com/rust-lang/rust/issues/45010>.
+
+//@ compile-flags: -g -Copt-level=0
+
+#[rustfmt::skip] // Having parameters on different lines is crucial for this test.
+pub fn foo(
+    x_parameter_not_in_std: i32,
+    y_parameter_not_in_std: i32,
+) -> i32 {
+    x_parameter_not_in_std + y_parameter_not_in_std
+}
+
+fn main() {
+    foo(42, 43); // Ensure `wasm32-wasip1` keeps `foo()` (even if `-Copt-level=0`)
+}
+
+// CHECK: !DILocalVariable(name: "x_parameter_not_in_std", arg: 1,
+// CHECK-SAME: line: 9
+// CHECK: !DILocalVariable(name: "y_parameter_not_in_std", arg: 2,
+// CHECK-SAME: line: 10