diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 217f179751..02a3b62287 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -10,7 +10,7 @@ on:
 env:
   CARGO_INCREMENTAL: 0
   CARGO_NET_RETRY: 10
-  RUN_SLOW_TESTS: 1
+  CI: 1
   RUST_BACKTRACE: short
   RUSTFLAGS: -D warnings
   RUSTUP_MAX_RETRIES: 10
diff --git a/crates/ra_assists/src/lib.rs b/crates/ra_assists/src/lib.rs
index fa3d3913f8..c698d6e8c4 100644
--- a/crates/ra_assists/src/lib.rs
+++ b/crates/ra_assists/src/lib.rs
@@ -5,6 +5,11 @@
 //! certain context. For example, if the cursor is over `,`, a "swap `,`" assist
 //! becomes available.
 
+#[allow(unused)]
+macro_rules! eprintln {
+    ($($tt:tt)*) => { stdx::eprintln!($($tt)*) };
+}
+
 mod assist_ctx;
 mod marks;
 #[cfg(test)]
diff --git a/crates/ra_hir/src/semantics.rs b/crates/ra_hir/src/semantics.rs
index 16a5fe9680..2ad231d368 100644
--- a/crates/ra_hir/src/semantics.rs
+++ b/crates/ra_hir/src/semantics.rs
@@ -9,6 +9,7 @@ use hir_def::{
     AsMacroCall, TraitId,
 };
 use hir_expand::ExpansionInfo;
+use itertools::Itertools;
 use ra_db::{FileId, FileRange};
 use ra_prof::profile;
 use ra_syntax::{
@@ -135,7 +136,6 @@ impl<'db, DB: HirDatabase> Semantics<'db, DB> {
         node: &SyntaxNode,
         offset: TextUnit,
     ) -> impl Iterator<Item = SyntaxNode> + '_ {
-        use itertools::Itertools;
         node.token_at_offset(offset)
             .map(|token| self.ancestors_with_macros(token.parent()))
             .kmerge_by(|node1, node2| node1.text_range().len() < node2.text_range().len())
diff --git a/crates/ra_hir_def/src/lib.rs b/crates/ra_hir_def/src/lib.rs
index bd32ac20aa..2d27bbdf8e 100644
--- a/crates/ra_hir_def/src/lib.rs
+++ b/crates/ra_hir_def/src/lib.rs
@@ -7,6 +7,11 @@
 //! Note that `hir_def` is a work in progress, so not all of the above is
 //! actually true.
 
+#[allow(unused)]
+macro_rules! eprintln {
+    ($($tt:tt)*) => { stdx::eprintln!($($tt)*) };
+}
+
 pub mod db;
 
 pub mod attr;
diff --git a/crates/ra_hir_ty/src/lib.rs b/crates/ra_hir_ty/src/lib.rs
index a9022dee77..9d61bba402 100644
--- a/crates/ra_hir_ty/src/lib.rs
+++ b/crates/ra_hir_ty/src/lib.rs
@@ -1,6 +1,11 @@
 //! The type system. We currently use this to infer types for completion, hover
 //! information and various assists.
 
+#[allow(unused)]
+macro_rules! eprintln {
+    ($($tt:tt)*) => { stdx::eprintln!($($tt)*) };
+}
+
 macro_rules! impl_froms {
     ($e:ident: $($v:ident $(($($sv:ident),*))?),*) => {
         $(
diff --git a/crates/ra_ide/src/lib.rs b/crates/ra_ide/src/lib.rs
index 2853810865..5599f143f2 100644
--- a/crates/ra_ide/src/lib.rs
+++ b/crates/ra_ide/src/lib.rs
@@ -10,6 +10,11 @@
 // For proving that RootDatabase is RefUnwindSafe.
 #![recursion_limit = "128"]
 
+#[allow(unused)]
+macro_rules! eprintln {
+    ($($tt:tt)*) => { stdx::eprintln!($($tt)*) };
+}
+
 pub mod mock_analysis;
 mod source_change;
 
diff --git a/crates/rust-analyzer/src/lib.rs b/crates/rust-analyzer/src/lib.rs
index 02953be303..036bf62a73 100644
--- a/crates/rust-analyzer/src/lib.rs
+++ b/crates/rust-analyzer/src/lib.rs
@@ -13,17 +13,8 @@
 pub mod cli;
 
 #[allow(unused)]
-macro_rules! println {
-    ($($tt:tt)*) => {
-        compile_error!("stdout is locked, use eprintln")
-    };
-}
-
-#[allow(unused)]
-macro_rules! print {
-    ($($tt:tt)*) => {
-        compile_error!("stdout is locked, use eprint")
-    };
+macro_rules! eprintln {
+    ($($tt:tt)*) => { stdx::eprintln!($($tt)*) };
 }
 
 mod vfs_glob;
diff --git a/crates/stdx/src/lib.rs b/crates/stdx/src/lib.rs
index d2efa22363..401a568bd5 100644
--- a/crates/stdx/src/lib.rs
+++ b/crates/stdx/src/lib.rs
@@ -2,6 +2,21 @@
 
 use std::{cell::Cell, fmt};
 
+#[inline(always)]
+pub fn is_ci() -> bool {
+    option_env!("CI").is_some()
+}
+
+#[macro_export]
+macro_rules! eprintln {
+    ($($tt:tt)*) => {{
+        if $crate::is_ci() {
+            panic!("Forgot to remove debug-print?")
+        }
+        std::eprintln!($($tt)*)
+    }}
+}
+
 /// Appends formatted string to a `String`.
 #[macro_export]
 macro_rules! format_to {