rustc_codegen_cranelift: bug on tail calls

Author: WaffleLapkin

compiler/rustc_codegen_cranelift/src/base.rs

@@ -434,6 +434,11 @@ fn codegen_fn_body(fx: &mut FunctionCx<'_, '_, '_>, start_block: Block) {
  )
  });
  }
+ // FIXME(explicit_tail_calls): add support for tail calls to the cranelift backend, once cranelift supports tail calls
+ TerminatorKind::TailCall { fn_span, .. } => span_bug!(
+ *fn_span,
+ "tail calls are not yet supported in `rustc_codegen_cranelift` backend"
+ ),
  TerminatorKind::InlineAsm {
  template,
  operands,

compiler/rustc_codegen_cranelift/src/constant.rs

@@ -566,6 +566,7 @@ pub(crate) fn mir_operand_get_const_val<'tcx>(
  {
  return None;
  }
+ TerminatorKind::TailCall { .. } => return None,
  TerminatorKind::Call { .. } => {}
  }
  }