use hashmap_core instead of std::collections::HashMap

Cargo.toml

@@ -18,6 +18,7 @@ std = ["parity-wasm/std"]
 [dependencies]
 parity-wasm = { version = "0.31", default-features = false }
 byteorder = "1.0"
+hashmap_core = "0.1.9"
 memory_units = "0.3.0"
 nan-preserving-float = "0.1.0"
 

src/imports.rs

@@ -1,4 +1,4 @@
-use std::collections::HashMap;
+use hashmap_core::HashMap;
 use global::GlobalRef;
 use memory::MemoryRef;
 use func::FuncRef;

src/lib.rs

@@ -104,6 +104,7 @@ extern crate assert_matches;
 
 extern crate parity_wasm;
 extern crate byteorder;
+extern crate hashmap_core;
 extern crate memory_units as memory_units_crate;
 
 pub extern crate nan_preserving_float;

src/module.rs

@@ -3,7 +3,7 @@ use Trap;
 use std::rc::Rc;
 use std::cell::RefCell;
 use std::fmt;
-use std::collections::HashMap;
+use hashmap_core::HashMap;
 use parity_wasm::elements::{External, InitExpr, Internal, Instruction, ResizableLimits, Type};
 use {Module, Error, Signature, MemoryInstance, RuntimeValue, TableInstance};
 use imports::ImportResolver;

src/validation/mod.rs

@@ -1,6 +1,6 @@
 use std::error;
 use std::fmt;
-use std::collections::HashSet;
+use hashmap_core::HashSet;
 use parity_wasm::elements::{
 	BlockType, External, GlobalEntry, GlobalType, Internal, MemoryType, Module, Instruction,
 	ResizableLimits, TableType, ValueType, InitExpr, Type,