diff --git a/pkgs/development/interpreters/evcxr/cargo-lock.patch b/pkgs/development/interpreters/evcxr/cargo-lock.patch
index 55b03711a680..6feaf12844c2 100644
--- a/pkgs/development/interpreters/evcxr/cargo-lock.patch
+++ b/pkgs/development/interpreters/evcxr/cargo-lock.patch
@@ -1,9 +1,11 @@
 diff --git a/Cargo.lock b/Cargo.lock
 new file mode 100644
-index 0000000..ea69beb
+index 0000000..edf585d
 --- /dev/null
 +++ b/Cargo.lock
-@@ -0,0 +1,824 @@
+@@ -0,0 +1,661 @@
++# This file is automatically @generated by Cargo.
++# It is not intended for manual editing.
 +[[package]]
 +name = "aho-corasick"
 +version = "0.6.10"
@@ -13,6 +15,11 @@ index 0000000..ea69beb
 +]
 +
 +[[package]]
++name = "approx"
++version = "0.1.1"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++
++[[package]]
 +name = "argon2rs"
 +version = "0.2.5"
 +source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -42,7 +49,7 @@ index 0000000..ea69beb
 + "autocfg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 + "backtrace-sys 0.1.28 (registry+https://github.com/rust-lang/crates.io-index)",
 + "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
-+ "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
++ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
 + "rustc-demangle 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)",
 + "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 +]
@@ -52,8 +59,8 @@ index 0000000..ea69beb
 +version = "0.1.28"
 +source = "registry+https://github.com/rust-lang/crates.io-index"
 +dependencies = [
-+ "cc 1.0.35 (registry+https://github.com/rust-lang/crates.io-index)",
-+ "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
++ "cc 1.0.36 (registry+https://github.com/rust-lang/crates.io-index)",
++ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
 +]
 +
 +[[package]]
@@ -66,7 +73,7 @@ index 0000000..ea69beb
 +
 +[[package]]
 +name = "bitflags"
-+version = "1.0.4"
++version = "1.0.5"
 +source = "registry+https://github.com/rust-lang/crates.io-index"
 +
 +[[package]]
@@ -79,37 +86,13 @@ index 0000000..ea69beb
 +]
 +
 +[[package]]
-+name = "block-buffer"
-+version = "0.7.3"
-+source = "registry+https://github.com/rust-lang/crates.io-index"
-+dependencies = [
-+ "block-padding 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
-+ "byte-tools 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
-+ "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
-+ "generic-array 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
-+]
-+
-+[[package]]
-+name = "block-padding"
-+version = "0.1.3"
-+source = "registry+https://github.com/rust-lang/crates.io-index"
-+dependencies = [
-+ "byte-tools 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
-+]
-+
-+[[package]]
-+name = "byte-tools"
-+version = "0.3.1"
-+source = "registry+https://github.com/rust-lang/crates.io-index"
-+
-+[[package]]
 +name = "byteorder"
 +version = "1.3.1"
 +source = "registry+https://github.com/rust-lang/crates.io-index"
 +
 +[[package]]
 +name = "cc"
-+version = "1.0.35"
++version = "1.0.36"
 +source = "registry+https://github.com/rust-lang/crates.io-index"
 +
 +[[package]]
@@ -118,13 +101,13 @@ index 0000000..ea69beb
 +source = "registry+https://github.com/rust-lang/crates.io-index"
 +
 +[[package]]
-+name = "chrono"
-+version = "0.4.6"
++name = "cgmath"
++version = "0.16.1"
 +source = "registry+https://github.com/rust-lang/crates.io-index"
 +dependencies = [
-+ "num-integer 0.1.39 (registry+https://github.com/rust-lang/crates.io-index)",
-+ "num-traits 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
-+ "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
++ "approx 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
++ "num-traits 0.1.43 (registry+https://github.com/rust-lang/crates.io-index)",
++ "rand 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
 +]
 +
 +[[package]]
@@ -132,15 +115,16 @@ index 0000000..ea69beb
 +version = "0.0.3"
 +source = "registry+https://github.com/rust-lang/crates.io-index"
 +dependencies = [
-+ "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
++ "bitflags 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
 +]
 +
 +[[package]]
 +name = "colored"
-+version = "1.7.0"
++version = "1.8.0"
 +source = "registry+https://github.com/rust-lang/crates.io-index"
 +dependencies = [
 + "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
++ "winconsole 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
 +]
 +
 +[[package]]
@@ -149,38 +133,16 @@ index 0000000..ea69beb
 +source = "registry+https://github.com/rust-lang/crates.io-index"
 +
 +[[package]]
-+name = "crypto-mac"
-+version = "0.7.0"
-+source = "registry+https://github.com/rust-lang/crates.io-index"
-+dependencies = [
-+ "generic-array 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
-+ "subtle 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
-+]
-+
-+[[package]]
-+name = "digest"
-+version = "0.8.0"
-+source = "registry+https://github.com/rust-lang/crates.io-index"
-+dependencies = [
-+ "generic-array 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
-+]
-+
-+[[package]]
 +name = "dirs"
 +version = "1.0.5"
 +source = "registry+https://github.com/rust-lang/crates.io-index"
 +dependencies = [
-+ "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
++ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
 + "redox_users 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 + "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 +]
 +
 +[[package]]
-+name = "error-chain"
-+version = "0.10.0"
-+source = "registry+https://github.com/rust-lang/crates.io-index"
-+
-+[[package]]
 +name = "evcxr"
 +version = "0.3.3"
 +dependencies = [
@@ -188,7 +150,7 @@ index 0000000..ea69beb
 + "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 + "json 0.11.13 (registry+https://github.com/rust-lang/crates.io-index)",
 + "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
-+ "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
++ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
 + "libloading 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
 + "proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
 + "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -199,27 +161,10 @@ index 0000000..ea69beb
 +]
 +
 +[[package]]
-+name = "evcxr_jupyter"
-+version = "0.3.3"
-+dependencies = [
-+ "chrono 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
-+ "colored 1.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
-+ "dirs 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
-+ "evcxr 0.3.3",
-+ "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
-+ "hex 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
-+ "hmac 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
-+ "json 0.11.13 (registry+https://github.com/rust-lang/crates.io-index)",
-+ "sha2 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
-+ "uuid 0.7.4 (registry+https://github.com/rust-lang/crates.io-index)",
-+ "zmq 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)",
-+]
-+
-+[[package]]
 +name = "evcxr_repl"
 +version = "0.3.3"
 +dependencies = [
-+ "colored 1.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
++ "colored 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
 + "dirs 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
 + "evcxr 0.3.3",
 + "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -256,38 +201,11 @@ index 0000000..ea69beb
 +]
 +
 +[[package]]
-+name = "fake-simd"
-+version = "0.1.2"
-+source = "registry+https://github.com/rust-lang/crates.io-index"
-+
-+[[package]]
 +name = "fuchsia-cprng"
 +version = "0.1.1"
 +source = "registry+https://github.com/rust-lang/crates.io-index"
 +
 +[[package]]
-+name = "generic-array"
-+version = "0.12.0"
-+source = "registry+https://github.com/rust-lang/crates.io-index"
-+dependencies = [
-+ "typenum 1.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
-+]
-+
-+[[package]]
-+name = "hex"
-+version = "0.3.2"
-+source = "registry+https://github.com/rust-lang/crates.io-index"
-+
-+[[package]]
-+name = "hmac"
-+version = "0.7.0"
-+source = "registry+https://github.com/rust-lang/crates.io-index"
-+dependencies = [
-+ "crypto-mac 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
-+ "digest 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
-+]
-+
-+[[package]]
 +name = "json"
 +version = "0.11.13"
 +source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -299,7 +217,7 @@ index 0000000..ea69beb
 +
 +[[package]]
 +name = "libc"
-+version = "0.2.51"
++version = "0.2.54"
 +source = "registry+https://github.com/rust-lang/crates.io-index"
 +
 +[[package]]
@@ -307,20 +225,12 @@ index 0000000..ea69beb
 +version = "0.5.0"
 +source = "registry+https://github.com/rust-lang/crates.io-index"
 +dependencies = [
-+ "cc 1.0.35 (registry+https://github.com/rust-lang/crates.io-index)",
++ "cc 1.0.36 (registry+https://github.com/rust-lang/crates.io-index)",
 + "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 +]
 +
 +[[package]]
 +name = "log"
-+version = "0.3.9"
-+source = "registry+https://github.com/rust-lang/crates.io-index"
-+dependencies = [
-+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
-+]
-+
-+[[package]]
-+name = "log"
 +version = "0.4.6"
 +source = "registry+https://github.com/rust-lang/crates.io-index"
 +dependencies = [
@@ -333,24 +243,14 @@ index 0000000..ea69beb
 +source = "registry+https://github.com/rust-lang/crates.io-index"
 +
 +[[package]]
-+name = "metadeps"
-+version = "1.1.2"
-+source = "registry+https://github.com/rust-lang/crates.io-index"
-+dependencies = [
-+ "error-chain 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
-+ "pkg-config 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
-+ "toml 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
-+]
-+
-+[[package]]
 +name = "nix"
 +version = "0.11.0"
 +source = "registry+https://github.com/rust-lang/crates.io-index"
 +dependencies = [
-+ "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
-+ "cc 1.0.35 (registry+https://github.com/rust-lang/crates.io-index)",
++ "bitflags 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
++ "cc 1.0.36 (registry+https://github.com/rust-lang/crates.io-index)",
 + "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
-+ "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
++ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
 + "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
 +]
 +
@@ -360,8 +260,8 @@ index 0000000..ea69beb
 +source = "registry+https://github.com/rust-lang/crates.io-index"
 +
 +[[package]]
-+name = "num-integer"
-+version = "0.1.39"
++name = "num-traits"
++version = "0.1.43"
 +source = "registry+https://github.com/rust-lang/crates.io-index"
 +dependencies = [
 + "num-traits 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -373,16 +273,6 @@ index 0000000..ea69beb
 +source = "registry+https://github.com/rust-lang/crates.io-index"
 +
 +[[package]]
-+name = "opaque-debug"
-+version = "0.2.2"
-+source = "registry+https://github.com/rust-lang/crates.io-index"
-+
-+[[package]]
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-+version = "0.3.14"
-+source = "registry+https://github.com/rust-lang/crates.io-index"
-+
-+[[package]]
 +name = "proc-macro2"
 +version = "0.4.27"
 +source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -400,16 +290,28 @@ index 0000000..ea69beb
 +
 +[[package]]
 +name = "rand"
++version = "0.4.6"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++dependencies = [
++ "fuchsia-cprng 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
++ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
++ "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
++ "rdrand 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
++ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
++]
++
++[[package]]
++name = "rand"
 +version = "0.6.5"
 +source = "registry+https://github.com/rust-lang/crates.io-index"
 +dependencies = [
 + "autocfg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
-+ "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
++ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
 + "rand_chacha 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 + "rand_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
 + "rand_hc 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 + "rand_isaac 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
-+ "rand_jitter 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
++ "rand_jitter 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
 + "rand_os 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
 + "rand_pcg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 + "rand_xorshift 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -456,10 +358,10 @@ index 0000000..ea69beb
 +
 +[[package]]
 +name = "rand_jitter"
-+version = "0.1.3"
++version = "0.1.4"
 +source = "registry+https://github.com/rust-lang/crates.io-index"
 +dependencies = [
-+ "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
++ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
 + "rand_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
 + "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 +]
@@ -471,7 +373,7 @@ index 0000000..ea69beb
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 + "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
 + "fuchsia-cprng 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
-+ "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
++ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
 + "rand_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
 + "rdrand 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
 + "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -547,6 +449,11 @@ index 0000000..ea69beb
 +]
 +
 +[[package]]
++name = "rgb"
++version = "0.8.13"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++
++[[package]]
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 +version = "0.1.14"
 +source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -557,7 +464,7 @@ index 0000000..ea69beb
 +source = "registry+https://github.com/rust-lang/crates.io-index"
 +dependencies = [
 + "dirs 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
-+ "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
++ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
 + "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
 + "memchr 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 + "nix 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -573,30 +480,14 @@ index 0000000..ea69beb
 +source = "registry+https://github.com/rust-lang/crates.io-index"
 +
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-+name = "sha2"
-+version = "0.8.0"
-+source = "registry+https://github.com/rust-lang/crates.io-index"
-+dependencies = [
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-+ "digest 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
-+ "fake-simd 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
-+ "opaque-debug 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
-+]
-+
-+[[package]]
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 +version = "1.0.0"
 +source = "registry+https://github.com/rust-lang/crates.io-index"
 +dependencies = [
-+ "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
++ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
 +]
 +
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-+name = "subtle"
-+version = "1.0.0"
-+source = "registry+https://github.com/rust-lang/crates.io-index"
-+
-+[[package]]
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 +version = "0.15.27"
 +source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -623,7 +514,7 @@ index 0000000..ea69beb
 +source = "registry+https://github.com/rust-lang/crates.io-index"
 +dependencies = [
 + "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
-+ "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
++ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
 + "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
 + "redox_syscall 0.1.54 (registry+https://github.com/rust-lang/crates.io-index)",
 + "remove_dir_all 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -639,26 +530,6 @@ index 0000000..ea69beb
 +]
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-+name = "time"
-+version = "0.1.42"
-+source = "registry+https://github.com/rust-lang/crates.io-index"
-+dependencies = [
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-+ "redox_syscall 0.1.54 (registry+https://github.com/rust-lang/crates.io-index)",
-+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
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-+source = "registry+https://github.com/rust-lang/crates.io-index"
-+
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-+version = "1.10.0"
-+source = "registry+https://github.com/rust-lang/crates.io-index"
-+
-+[[package]]
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 +version = "0.1.3"
 +source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -689,14 +560,6 @@ index 0000000..ea69beb
 +source = "registry+https://github.com/rust-lang/crates.io-index"
 +
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-+name = "uuid"
-+version = "0.7.4"
-+source = "registry+https://github.com/rust-lang/crates.io-index"
-+dependencies = [
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-+]
-+
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@@ -802,29 +645,40 @@ index 0000000..ea69beb
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+diff --git a/Cargo.toml b/Cargo.toml
+index d09a342..5377ed0 100644
+--- a/Cargo.toml
++++ b/Cargo.toml
+@@ -2,10 +2,9 @@
+ members = [
+   "evcxr",
+   "evcxr_repl",
+-  "evcxr_jupyter",
+   "evcxr_runtime",
+ ]
+ 
+ exclude = [
+   "runtimes"
+-]
+\ No newline at end of file
++]
diff --git a/pkgs/development/interpreters/evcxr/default.nix b/pkgs/development/interpreters/evcxr/default.nix
index 5270922f3875..3a517cb03be9 100644
--- a/pkgs/development/interpreters/evcxr/default.nix
+++ b/pkgs/development/interpreters/evcxr/default.nix
@@ -1,4 +1,4 @@
-{ cargo, fetchFromGitHub, makeWrapper, pkgconfig, rustPlatform, stdenv, zeromq }:
+{ cargo, fetchFromGitHub, makeWrapper, pkgconfig, rustPlatform, stdenv }:
 
 rustPlatform.buildRustPackage rec {
   name = "evcxr-${version}";
@@ -11,15 +11,18 @@ rustPlatform.buildRustPackage rec {
     sha256 = "1apc93z9vvf6qks5x2pad45rnrj9kjl812rj78w5zmmizccp2fhf";
   };
 
-  cargoSha256 = "1pvw1jfi4p0cla4xxzgxh1jskvbmsyi4l5cimiis7093hyjs0svw";
+  cargoSha256 = "0bd6yna8yyrqjv4w7qr2923nljbjjlbkyad6vjlgfp33yn2pz1iv";
   cargoPatches = [ ./cargo-lock.patch ];
 
-  nativeBuildInputs = [ pkgconfig zeromq ];
-  buildInputs = [ cargo makeWrapper ];
-  postInstall = "wrapProgram $out/bin/evcxr --prefix PATH : ${cargo}/bin";
+  nativeBuildInputs = [ pkgconfig makeWrapper ];
+  buildInputs = [ cargo ];
+  postInstall = ''
+    wrapProgram $out/bin/evcxr --prefix PATH : ${cargo}/bin
+    rm $out/bin/testing_runtime
+  '';
 
   meta = {
-    description = "An evaluation context for Rust, including a CLI REPL and a Jupyter kernel";
+    description = "An evaluation context for Rust";
     homepage = "https://github.com/google/evcxr";
     license = stdenv.lib.licenses.asl20;
     maintainers = [ stdenv.lib.maintainers.protoben ];