--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,17 +2,37 @@
 # It is not intended for manual editing.
 [[package]]
 name = "annotate-snippets"
-version = "0.8.0"
+version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d78ea013094e5ea606b1c05fe35f1dd7ea1eb1ea259908d040b25bd5ec677ee5"
+checksum = "5c96c3d1062ea7101741480185a6a1275eab01cbe8b20e378d1311bc056d2e08"
+dependencies = [
+ "unicode-width",
+]
 
 [[package]]
+name = "atty"
+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8"
+dependencies = [
+ "hermit-abi",
+ "libc",
+ "winapi",
+]
+
+[[package]]
 name = "autocfg"
 version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f8aac770f1885fd7e387acedd76065302551364496e46b3dd00860b2f8359b9d"
 
 [[package]]
+name = "base64"
+version = "0.12.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3441f0f7b02788e948e47f457ca01f1d7e6d92c693bc132c22b087d3141c03ff"
+
+[[package]]
 name = "bincode"
 version = "1.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -46,11 +66,14 @@
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "860643c53f980f0d38a5e25dfab6c3c93b2cb3aa1fe192643d17a293c6c41936"
 dependencies = [
+ "atty",
  "bitflags",
  "clap_derive",
  "indexmap",
  "lazy_static",
  "os_str_bytes",
+ "strsim",
+ "termcolor",
  "textwrap",
  "unicode-width",
  "vec_map",
@@ -85,6 +108,15 @@
 ]
 
 [[package]]
+name = "hermit-abi"
+version = "0.1.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b9586eedd4ce6b3c498bc3b4dd92fc9f11166aa908a914071953768066c67909"
+dependencies = [
+ "libc",
+]
+
+[[package]]
 name = "indexmap"
 version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -97,10 +129,10 @@
 name = "jrsonnet"
 version = "1.0.0"
 dependencies = [
- "annotate-snippets",
  "clap",
  "jrsonnet-evaluator",
  "jrsonnet-parser",
+ "jrsonnet-trace",
  "mimallocator",
 ]
 
@@ -136,6 +168,16 @@
 version = "1.0.0"
 
 [[package]]
+name = "jrsonnet-trace"
+version = "1.0.0"
+dependencies = [
+ "annotate-snippets",
+ "jrsonnet-evaluator",
+ "jrsonnet-parser",
+ "pathdiff",
+]
+
+[[package]]
 name = "jsonnet"
 version = "0.1.0"
 dependencies = [
@@ -188,6 +230,12 @@
 checksum = "06de47b848347d8c4c94219ad8ecd35eb90231704b067e67e6ae2e36ee023510"
 
 [[package]]
+name = "pathdiff"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "877630b3de15c0b64cc52f659345724fbf6bdad9bd9566699fc53688f3c34a34"
+
+[[package]]
 name = "peg"
 version = "0.6.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -279,6 +327,12 @@
 ]
 
 [[package]]
+name = "strsim"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"
+
+[[package]]
 name = "structdump"
 version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -318,6 +372,15 @@
 ]
 
 [[package]]
+name = "termcolor"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bb6bfa289a4d7c5766392812c0a1f4c1ba45afa1ad47803c11e1f407d846d75f"
+dependencies = [
+ "winapi-util",
+]
+
+[[package]]
 name = "textwrap"
 version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -361,3 +424,34 @@
 version = "0.9.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b5a972e5669d67ba988ce3dc826706fb0a8b01471c088cb0b6110b805cc36aed"
+
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-util"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,6 +3,7 @@
 	"crates/jrsonnet-parser",
 	"crates/jrsonnet-evaluator",
 	"crates/jrsonnet-stdlib",
+	"crates/jrsonnet-trace",
 	"bindings/jsonnet",
 	"cmds/jrsonnet"
 ]