fix: use a smaller CustomConfig for 32-bit tests (#84)

This way, the custom-config tests from PR #80 can still be run on 32-bit
targets.

Fixes #82

src/tests/custom_config.rs

@@ -3,16 +3,26 @@
 
 #![cfg(not(loom))]
 
-use crate::{Config, Slab};
+use crate::{cfg::CfgPrivate, Config, Slab};
 
 struct CustomConfig;
+
+#[cfg(target_pointer_width = "64")]
 impl Config for CustomConfig {
     const INITIAL_PAGE_SIZE: usize = 32;
     const MAX_PAGES: usize = 15;
     const MAX_THREADS: usize = 256;
     const RESERVED_BITS: usize = 24;
 }
 
+#[cfg(not(target_pointer_width = "64"))]
+impl Config for CustomConfig32 {
+    const INITIAL_PAGE_SIZE: usize = 16;
+    const MAX_PAGES: usize = 7;
+    const MAX_THREADS: usize = 128;
+    const RESERVED_BITS: usize = 12;
+}
+
 // We should repeat actions several times to detect invalid lifecycle changes.
 const ITERS: u64 = 5;
 
@@ -29,6 +39,8 @@ fn slab_eq(mut lhs: Slab<u64, impl Config>, mut rhs: Slab<u64, impl Config>) {
 /// Initially, it revealed bugs in the `Slot::release_with()` implementation.
 #[test]
 fn insert_remove() {
+    eprintln!("bits={}; config={:#?}", usize::BITS, CustomConfig::debug());
+
     let default_slab = Slab::<u64, _>::new();
     let custom_slab = Slab::<u64, _>::new_with_config::<CustomConfig>();
 
@@ -47,6 +59,8 @@ fn insert_remove() {
 /// Initially, it revealed bugs in the `Slot::get()` implementation.
 #[test]
 fn double_get() {
+    eprintln!("bits={}; config={:#?}", usize::BITS, CustomConfig::debug());
+
     let default_slab = Slab::<u64, _>::new();
     let custom_slab = Slab::<u64, _>::new_with_config::<CustomConfig>();