No std

plonky2/src/iop/witness.rs

@@ -1,6 +1,6 @@
 #[cfg(not(feature = "std"))]
 use alloc::{vec, vec::Vec};
-use std::iter::zip;
+use core::iter::zip;
 
 use anyhow::{anyhow, Result};
 use hashbrown::HashMap;

starky/src/fibonacci_stark.rs

@@ -3,7 +3,7 @@
 //! to highlight the use of the permutation argument with logUp.
 
 #[cfg(not(feature = "std"))]
-use alloc::{vec, vec::Vec};
+use alloc::vec::Vec;
 use core::marker::PhantomData;
 
 use plonky2::field::extension::{Extendable, FieldExtension};

starky/src/lookup.rs

@@ -7,6 +7,7 @@ use core::borrow::Borrow;
 use core::fmt::Debug;
 use core::iter::repeat;
 
+#[cfg(feature = "std")]
 use itertools::Itertools;
 use num_bigint::BigUint;
 use plonky2::field::batch_util::{batch_add_inplace, batch_multiply_inplace};

starky/src/unconstrained_stark.rs

@@ -2,7 +2,7 @@
 //! a proof of knowledge of the trace)
 
 #[cfg(not(feature = "std"))]
-use alloc::{vec, vec::Vec};
+use alloc::vec::Vec;
 use core::marker::PhantomData;
 
 use plonky2::field::extension::{Extendable, FieldExtension};