core/expr: Implement negative indices for ndarray

nac3core/src/codegen/expr.rs

@@ -9,6 +9,7 @@ use crate::{
             ListValue,
             NDArrayValue,
             RangeValue,
+            TypedArrayLikeAccessor,
             UntypedArrayLikeAccessor,
         },
         concrete_type::{ConcreteFuncArg, ConcreteTypeEnum, ConcreteTypeStore},
@@ -18,7 +19,7 @@ use crate::{
         irrt::*,
         llvm_intrinsics::{call_expect, call_float_floor, call_float_pow, call_float_powi},
         numpy,
-        stmt::{gen_raise, gen_var},
+        stmt::{gen_if_else_expr_callback, gen_raise, gen_var},
         CodeGenContext, CodeGenTask,
     },
     symbol_resolver::{SymbolValue, ValueEnum},
@@ -44,8 +45,6 @@ use itertools::{chain, izip, Itertools, Either};
 use nac3parser::ast::{
     self, Boolop, Comprehension, Constant, Expr, ExprKind, Location, Operator, StrRef,
 };
-use crate::codegen::classes::TypedArrayLikeAccessor;
-use crate::codegen::stmt::gen_if_else_expr_callback;
 
 use super::{CodeGenerator, llvm_intrinsics::call_memcpy_generic, need_sret};