diff --git a/CHANGELOG.md b/CHANGELOG.md
index 29043b5..ae8268b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+# v0.4.5 (2020-1-20)
+Just a small intermediate release.
+
+* Fix some bugs.
+* Populate license files into subfolders.
+
 # v0.4.4 (2019-11-13)
 * Fix `abort_if_dirty` + warnings bug
 * Allow trailing commas in macros
diff --git a/proc-macro-error-attr/src/lib.rs b/proc-macro-error-attr/src/lib.rs
index 3c1013b..5d3b202 100644
--- a/proc-macro-error-attr/src/lib.rs
+++ b/proc-macro-error-attr/src/lib.rs
@@ -34,6 +34,10 @@ pub fn proc_macro_error(attr: TokenStream, input: TokenStream) -> TokenStream {
         settings.set(ProcMacroHack);
     }
 
+    if settings.is_set(ProcMacroHack) {
+        settings.set(AllowNotMacro);
+    }
+
     if !(settings.is_set(AllowNotMacro) || is_proc_macro) {
         return quote!(
             #input
diff --git a/proc-macro-error/src/lib.rs b/proc-macro-error/src/lib.rs
index 5fb0223..ab99a99 100644
--- a/proc-macro-error/src/lib.rs
+++ b/proc-macro-error/src/lib.rs
@@ -135,6 +135,11 @@
 //!     If, for some reason, you can't place it like that you can use
 //!     `#[proc_macro_error(proc_macro_hack)]` instead.
 //!
+//!     # Note
+//!
+//!     If `proc-macro-hack` was detected (by any means) `allow_not_macro`
+//!     and `assert_unwind_safe` will be applied automatically.
+//!
 //! - `allow_not_macro`:
 //!
 //!     By default, the attribute checks that it's applied to a proc-macro.
@@ -145,6 +150,8 @@
 //!
 //!     Please note: the function this attribute is applied to must return `proc_macro::TokenStream`.
 //!
+//!     This setting is implied if `proc-macro-hack` was detected.
+//!
 //! - `assert_unwind_safe`:
 //!
 //!     By default, your code must be [unwind safe]. If your code is not unwind safe but you believe
@@ -154,6 +161,8 @@
 //!     This setting is implied if `#[proc_macro_error]` is applied to a function
 //!     marked as `#[proc_macro]`, `#[proc_macro_derive]` or `#[proc_macro_attribute]`.
 //!
+//!     This setting is also implied if `proc-macro-hack` was detected.
+//!
 //! ### Diagnostic type
 //!
 //! [`Diagnostic`] type is intentionally designed to be API compatible with [`proc_macro::Diagnostic`].
diff --git a/proc-macro-error/src/nightly.rs b/proc-macro-error/src/nightly.rs
index d053c2f..2d18577 100644
--- a/proc-macro-error/src/nightly.rs
+++ b/proc-macro-error/src/nightly.rs
@@ -1,4 +1,4 @@
-use std::sync::atomic::{AtomicBool, Ordering};
+use std::cell::Cell;
 
 use proc_macro::{Diagnostic as PDiag, Level as PLevel};
 
@@ -6,12 +6,13 @@ use crate::{abort_now, check_correctness, Diagnostic, Level, SuggestionKind};
 
 pub fn abort_if_dirty() {
     check_correctness();
-    if IS_DIRTY.load(Ordering::SeqCst) {
+    if IS_DIRTY.with(|c| c.get()) {
         abort_now()
     }
 }
 
 pub(crate) fn cleanup() -> Vec<Diagnostic> {
+    IS_DIRTY.with(|c| c.set(false));
     vec![]
 }
 
@@ -26,7 +27,7 @@ pub(crate) fn emit_diagnostic(diag: Diagnostic) {
     let level = match level {
         Level::Warning => PLevel::Warning,
         Level::Error => {
-            IS_DIRTY.store(true, Ordering::SeqCst);
+            IS_DIRTY.with(|c| c.set(true));
             PLevel::Error
         }
         _ => unreachable!(),
@@ -46,4 +47,6 @@ pub(crate) fn emit_diagnostic(diag: Diagnostic) {
     res.emit()
 }
 
-static IS_DIRTY: AtomicBool = AtomicBool::new(false);
+thread_local! {
+    static IS_DIRTY: Cell<bool> = Cell::new(false);
+}