diff --git a/ergotree-ir/Cargo.toml b/ergotree-ir/Cargo.toml
index d6ec1ac92..b7062ecc4 100644
--- a/ergotree-ir/Cargo.toml
+++ b/ergotree-ir/Cargo.toml
@@ -6,9 +6,7 @@ authors = ["Denys Zadorozhnyi <denys@zadorozhnyi.com>"]
 repository.workspace = true
 edition.workspace = true
 description = "ErgoTree IR, serialization"
-exclude = [
-    "proptest-regressions/*"
-]
+exclude = ["proptest-regressions/*"]
 
 [lib]
 crate-type = ["cdylib", "rlib"]
@@ -22,7 +20,7 @@ elliptic-curve = { workspace = true }
 thiserror = { workspace = true }
 lazy_static = { workspace = true }
 derive_more = { workspace = true }
-proptest = { workspace = true , optional = true }
+proptest = { workspace = true, optional = true }
 proptest-derive = { workspace = true, optional = true }
 bs58 = { workspace = true }
 base16 = { workspace = true }
@@ -32,7 +30,7 @@ num-traits = { workspace = true }
 num-derive = { workspace = true }
 num-integer = { workspace = true }
 indexmap = { workspace = true }
-serde = { workspace = true , optional = true }
+serde = { workspace = true, optional = true }
 serde_json = { workspace = true, optional = true }
 serde_with = { workspace = true, optional = true }
 num256 = "0.3.1"
@@ -49,3 +47,4 @@ json = ["serde", "serde_json", "serde_with", "bounded-vec/serde"]
 sigma-test-util = { workspace = true }
 rand = { workspace = true }
 pretty_assertions = { workspace = true }
+expect-test = { workspace = true }
diff --git a/ergotree-ir/src/lib.rs b/ergotree-ir/src/lib.rs
index b2ac46230..872c3fa42 100644
--- a/ergotree-ir/src/lib.rs
+++ b/ergotree-ir/src/lib.rs
@@ -32,3 +32,4 @@ pub mod source_span;
 pub mod type_check;
 pub mod types;
 pub mod util;
+mod pretty_printer;
diff --git a/ergotree-ir/src/pretty_printer.rs b/ergotree-ir/src/pretty_printer.rs
new file mode 100644
index 000000000..e771c1413
--- /dev/null
+++ b/ergotree-ir/src/pretty_printer.rs
@@ -0,0 +1,62 @@
+use crate::mir::expr::Expr;
+
+pub(crate) struct PrintExpr {
+    expr: Expr,
+    text: String,
+}
+
+#[derive(PartialEq, Eq, Debug, Clone)]
+pub(crate) enum PrintError {}
+
+#[allow(clippy::todo)]
+pub(crate) fn print_expr(expr: Expr) -> Result<PrintExpr, PrintError> {
+   todo!()
+}
+
+#[allow(clippy::unwrap_used)]
+#[cfg(test)]
+mod tests {
+
+    use expect_test::expect;
+
+    use crate::mir::block::BlockValue;
+    use crate::mir::val_def::ValDef;
+    use crate::mir::val_use::ValUse;
+    use crate::types::stype::SType;
+
+    use super::*;
+
+    fn check(expr: Expr, expected_tree: expect_test::Expect) {
+        let expected_out = print_expr(expr).unwrap();
+        expected_tree.assert_eq(&expected_out.text);
+    }
+
+    #[test]
+    fn smoke() {
+        let val_id = 2.into();
+        let body = Expr::BlockValue(BlockValue {
+            items: vec![ValDef {
+                id: val_id,
+                rhs: Box::new(Expr::Const(1i32.into())),
+            }
+            .into()],
+            result: Box::new(
+                ValUse {
+                    val_id,
+                    tpe: SType::SInt,
+                }
+                .into(),
+            ),
+        });
+        let expr = Expr::Const(1i32.into());
+        check(
+            expr,
+            expect![[r#"
+            {
+                val v1 = 1
+                v1
+            }
+            "#]],
+        );
+    }
+}