From a18ff0dbf1a9c3cabf52b693741f20026de7c6fa Mon Sep 17 00:00:00 2001
From: "NGnius (Graham)" <ngniusness@gmail.com>
Date: Fri, 1 Jul 2022 12:18:59 -0400
Subject: [PATCH] Add fuzzing and fix some bugs discovered by it

---
 Cargo.lock                                    |  151 +-
 mps-interpreter/fuzz/.gitignore               |    3 +
 mps-interpreter/fuzz/Cargo.lock               | 1342 +++++++++++++++++
 mps-interpreter/fuzz/Cargo.toml               |   25 +
 .../fuzz/fuzz_targets/faye_fuzz.rs            |   20 +
 mps-interpreter/src/lang/filter.rs            |   18 +-
 .../src/lang/vocabulary/variable_assign.rs    |   10 +
 7 files changed, 1495 insertions(+), 74 deletions(-)
 create mode 100644 mps-interpreter/fuzz/.gitignore
 create mode 100644 mps-interpreter/fuzz/Cargo.lock
 create mode 100644 mps-interpreter/fuzz/Cargo.toml
 create mode 100644 mps-interpreter/fuzz/fuzz_targets/faye_fuzz.rs

diff --git a/Cargo.lock b/Cargo.lock
index bd473a6..ae83303 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -70,9 +70,9 @@ dependencies = [
 
 [[package]]
 name = "anyhow"
-version = "1.0.57"
+version = "1.0.58"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "08f9b8508dccb7687a1d6c4ce66b2b0ecef467c94667de27d8d7fe1f8d2a9cdc"
+checksum = "bb07d2053ccdbe10e2af2995a2f116c1330396493dc1269f6a91d0ae82e19704"
 
 [[package]]
 name = "arrayvec"
@@ -220,9 +220,9 @@ checksum = "40e38929add23cdf8a366df9b0e088953150724bcbe5fc330b0d8eb3b328eec8"
 
 [[package]]
 name = "bumpalo"
-version = "3.9.1"
+version = "3.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a4a45a46ab1f2412e53d3a0ade76ffad2025804294569aae387231a0cd6e0899"
+checksum = "37ccbd214614c6783386c1af30caf03192f17891059cecc394b4fb119e363de3"
 
 [[package]]
 name = "byte-tools"
@@ -346,16 +346,16 @@ dependencies = [
 
 [[package]]
 name = "clap"
-version = "3.1.18"
+version = "3.2.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d2dbdf4bdacb33466e854ce889eee8dfd5729abf7ccd7664d0a2d60cd384440b"
+checksum = "190814073e85d238f31ff738fcb0bf6910cedeb73376c87cd69291028966fd83"
 dependencies = [
  "atty",
  "bitflags",
  "clap_derive",
  "clap_lex",
  "indexmap",
- "lazy_static 1.4.0",
+ "once_cell",
  "strsim 0.10.0",
  "termcolor",
  "textwrap 0.15.0",
@@ -363,9 +363,9 @@ dependencies = [
 
 [[package]]
 name = "clap_derive"
-version = "3.1.18"
+version = "3.2.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "25320346e922cffe59c0bbc5410c8d8784509efb321488971081313cb1e1a33c"
+checksum = "759bf187376e1afa7b85b959e6a664a3e7a95203415dba952ad19139e798f902"
 dependencies = [
  "heck 0.4.0",
  "proc-macro-error",
@@ -376,9 +376,9 @@ dependencies = [
 
 [[package]]
 name = "clap_lex"
-version = "0.2.0"
+version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a37c35f1112dad5e6e0b1adaff798507497a18fceeb30cceb3bae7d1427b9213"
+checksum = "2850f2f5a82cbf437dd5af4d49848fbdfc27c157c3d010345776f952765261c5"
 dependencies = [
  "os_str_bytes",
 ]
@@ -525,9 +525,9 @@ dependencies = [
 
 [[package]]
 name = "crossbeam-channel"
-version = "0.5.4"
+version = "0.5.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5aaa7bd5fb665c6864b5f963dd9097905c54125909c7aa94c9e18507cdbe6c53"
+checksum = "4c02a4d71819009c192cf4872265391563fd6a84c81ff2c0f2a7026ca4c1d85c"
 dependencies = [
  "cfg-if",
  "crossbeam-utils",
@@ -546,15 +546,15 @@ dependencies = [
 
 [[package]]
 name = "crossbeam-epoch"
-version = "0.9.8"
+version = "0.9.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1145cf131a2c6ba0615079ab6a638f7e1973ac9c2634fcbeaaad6114246efe8c"
+checksum = "07db9d94cbd326813772c968ccd25999e5f8ae22f4f8d1b11effa37ef6ce281d"
 dependencies = [
  "autocfg",
  "cfg-if",
  "crossbeam-utils",
- "lazy_static 1.4.0",
  "memoffset",
+ "once_cell",
  "scopeguard",
 ]
 
@@ -570,12 +570,12 @@ dependencies = [
 
 [[package]]
 name = "crossbeam-utils"
-version = "0.8.8"
+version = "0.8.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0bf124c720b7686e3c2663cf54062ab0f68a88af2fb6a030e87e30bf721fcb38"
+checksum = "7d82ee10ce34d7bc12c2122495e7593a9c41347ecdd64185af4ecf72cb1a7f83"
 dependencies = [
  "cfg-if",
- "lazy_static 1.4.0",
+ "once_cell",
 ]
 
 [[package]]
@@ -706,9 +706,9 @@ dependencies = [
 
 [[package]]
 name = "either"
-version = "1.6.1"
+version = "1.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e78d4f1cc4ae33bbfc157ed5d5a5ef3bc29227303d595861deb238fcec4e9457"
+checksum = "3f107b87b6afc2a64fd13cac55fe06d6c8859f12d4b14cbcdd2c67d0976781be"
 
 [[package]]
 name = "encode_unicode"
@@ -843,13 +843,13 @@ dependencies = [
 
 [[package]]
 name = "getrandom"
-version = "0.2.6"
+version = "0.2.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9be70c98951c83b8d2f8f60d7065fa6d5146873094452a1008da8c2f1e4205ad"
+checksum = "4eb1a864a501629691edf6c15a593b7a51eebaa1e8468e9ddc623de7c9b58ec6"
 dependencies = [
  "cfg-if",
  "libc",
- "wasi",
+ "wasi 0.11.0+wasi-snapshot-preview1",
 ]
 
 [[package]]
@@ -873,13 +873,19 @@ dependencies = [
  "ahash",
 ]
 
+[[package]]
+name = "hashbrown"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "db0d4cf898abf0081f964436dc980e96670a0f36863e4b83aaacdb65c9d7ccc3"
+
 [[package]]
 name = "hashlink"
 version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7249a3129cbc1ffccd74857f81464a323a152173cdb134e0fd81bc803b29facf"
 dependencies = [
- "hashbrown",
+ "hashbrown 0.11.2",
 ]
 
 [[package]]
@@ -926,12 +932,12 @@ checksum = "b9e0384b61958566e926dc50660321d12159025e767c18e043daf26b70104c39"
 
 [[package]]
 name = "indexmap"
-version = "1.8.2"
+version = "1.9.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e6012d540c5baa3589337a98ce73408de9b5a25ec9fc2c6fd6be8f0d39e0ca5a"
+checksum = "10a35a97730320ffe8e2d410b5d3b69279b98d2c14bdb8b70ea89ecf7888d41e"
 dependencies = [
  "autocfg",
- "hashbrown",
+ "hashbrown 0.12.1",
 ]
 
 [[package]]
@@ -995,9 +1001,9 @@ dependencies = [
 
 [[package]]
 name = "js-sys"
-version = "0.3.57"
+version = "0.3.58"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "671a26f820db17c2a2750743f1dd03bafd15b98c9f30c7c2628c024c05d73397"
+checksum = "c3fac17f7123a73ca62df411b1bf727ccc805daa070338fda671c86dac1bdc27"
 dependencies = [
  "wasm-bindgen",
 ]
@@ -1197,9 +1203,9 @@ dependencies = [
 
 [[package]]
 name = "miniz_oxide"
-version = "0.5.1"
+version = "0.5.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d2b29bd4bc3f33391105ebee3589c19197c4271e3e5a9ec9bfe8127eeff8f082"
+checksum = "6f5c75688da582b8ffc1f1799e9db273f32133c49e048f614d22ec3256773ccc"
 dependencies = [
  "adler",
 ]
@@ -1226,7 +1232,7 @@ dependencies = [
 name = "mps"
 version = "0.8.0"
 dependencies = [
- "clap 3.1.18",
+ "clap 3.2.8",
  "console",
  "mps-interpreter",
  "mps-player",
@@ -1252,7 +1258,7 @@ dependencies = [
 name = "mps-m3u8"
 version = "0.8.0"
 dependencies = [
- "clap 3.1.18",
+ "clap 3.2.8",
  "m3u8-rs",
  "mps-interpreter",
 ]
@@ -1276,7 +1282,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dec23e6762830658d2b3d385a75aa212af2f67a4586d4442907144f3bb6a1ca8"
 dependencies = [
  "matrixmultiply",
- "num-complex 0.4.1",
+ "num-complex 0.4.2",
  "num-integer",
  "num-traits",
  "rawpointer",
@@ -1291,7 +1297,7 @@ checksum = "f85776816e34becd8bd9540818d7dc77bf28307f3b3dcc51cc82403c6931680c"
 dependencies = [
  "byteorder",
  "ndarray",
- "num-complex 0.4.1",
+ "num-complex 0.4.2",
  "num-traits",
  "py_literal",
  "zip",
@@ -1433,9 +1439,9 @@ dependencies = [
 
 [[package]]
 name = "num-complex"
-version = "0.4.1"
+version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97fbc387afefefd5e9e39493299f3069e14a140dd34dc19b4c1c1a8fddb6a790"
+checksum = "7ae39348c8bc5fbd7f40c727a9925f03517afd2ab27d46702108b6a7e5414c19"
 dependencies = [
  "num-traits",
 ]
@@ -1733,9 +1739,9 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.39"
+version = "1.0.40"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c54b25569025b7fc9651de43004ae593a75ad88543b17178aa5e1b9c4f15f56f"
+checksum = "dd96a1e8ed2596c337f8eae5f24924ec83f5ad5ab21ea8e455d3566c69fbcaf7"
 dependencies = [
  "unicode-ident",
 ]
@@ -1747,7 +1753,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "102df7a3d46db9d3891f178dcc826dc270a6746277a9ae6436f8d29fd490a8e1"
 dependencies = [
  "num-bigint",
- "num-complex 0.4.1",
+ "num-complex 0.4.2",
  "num-traits",
  "pest",
  "pest_derive",
@@ -1755,9 +1761,9 @@ dependencies = [
 
 [[package]]
 name = "quote"
-version = "1.0.18"
+version = "1.0.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a1feb54ed693b93a84e14094943b84b7c4eae204c512b7ccb95ab0c66d278ad1"
+checksum = "3bcdf212e9776fbcb2d23ab029360416bb1706b1aea2d1a5ba002727cbcab804"
 dependencies = [
  "proc-macro2",
 ]
@@ -1982,9 +1988,9 @@ checksum = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
 
 [[package]]
 name = "semver"
-version = "1.0.9"
+version = "1.0.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8cb243bdfdb5936c8dc3c45762a19d12ab4550cdc753bc247637d4ec35a040fd"
+checksum = "3d92beeab217753479be2f74e54187a6aed4c125ff0703a866c3147a02f0c6dd"
 
 [[package]]
 name = "serde"
@@ -2018,9 +2024,9 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.81"
+version = "1.0.82"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9b7ce2b32a1aed03c558dc61a5cd328f15aff2dbc17daad8fb8af04d2100e15c"
+checksum = "82c2c1fdcd807d1098552c5b9a36e425e42e9fbd7c6a37a8425f390f781f7fa7"
 dependencies = [
  "itoa 1.0.2",
  "ryu",
@@ -2067,9 +2073,9 @@ dependencies = [
 
 [[package]]
 name = "smallvec"
-version = "1.8.0"
+version = "1.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f2dd574626839106c320a323308629dcb1acfc96e32a8cba364ddc61ac23ee83"
+checksum = "2fd0db749597d91ff862fd1d55ea87f7855a744a8425a64695b6fca237d1dad1"
 
 [[package]]
 name = "stdweb"
@@ -2433,9 +2439,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "1.0.95"
+version = "1.0.98"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fbaf6116ab8924f39d52792136fb74fd60a80194cf1b1c6ffa6453eef1c3f942"
+checksum = "c50aef8a904de4c23c788f104b7dddc7d6f79c647c7c8ce4cc8f73eb0ca773dd"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -2517,11 +2523,12 @@ dependencies = [
 
 [[package]]
 name = "time"
-version = "0.1.43"
+version = "0.1.44"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca8a50ef2360fbd1eeb0ecd46795a87a19024eb4b53c5dc916ca1fd95fe62438"
+checksum = "6db9e6914ab8b1ae1c260a4ae7a49b6c5611b40328a735b21862567685e73255"
 dependencies = [
  "libc",
+ "wasi 0.10.0+wasi-snapshot-preview1",
  "winapi 0.3.9",
 ]
 
@@ -2592,9 +2599,9 @@ dependencies = [
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.0"
+version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d22af068fba1eb5edcb4aea19d382b2a3deb4c8f9d475c589b6ada9e0fd493ee"
+checksum = "5bd2fe26506023ed7b5e1e315add59d6f584c621d037f9368fea9cfb988f368c"
 
 [[package]]
 name = "unicode-segmentation"
@@ -2651,15 +2658,21 @@ dependencies = [
 
 [[package]]
 name = "wasi"
-version = "0.10.2+wasi-snapshot-preview1"
+version = "0.10.0+wasi-snapshot-preview1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fd6fbd9a79829dd1ad0cc20627bf1ed606756a7f77edff7b66b7064f9cb327c6"
+checksum = "1a143597ca7c7793eff794def352d41792a93c481eb1042423ff7ff72ba2c31f"
+
+[[package]]
+name = "wasi"
+version = "0.11.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
 
 [[package]]
 name = "wasm-bindgen"
-version = "0.2.80"
+version = "0.2.81"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "27370197c907c55e3f1a9fbe26f44e937fe6451368324e009cba39e139dc08ad"
+checksum = "7c53b543413a17a202f4be280a7e5c62a1c69345f5de525ee64f8cfdbc954994"
 dependencies = [
  "cfg-if",
  "wasm-bindgen-macro",
@@ -2667,9 +2680,9 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-backend"
-version = "0.2.80"
+version = "0.2.81"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "53e04185bfa3a779273da532f5025e33398409573f348985af9a1cbf3774d3f4"
+checksum = "5491a68ab4500fa6b4d726bd67408630c3dbe9c4fe7bda16d5c82a1fd8c7340a"
 dependencies = [
  "bumpalo",
  "lazy_static 1.4.0",
@@ -2682,9 +2695,9 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-macro"
-version = "0.2.80"
+version = "0.2.81"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "17cae7ff784d7e83a2fe7611cfe766ecf034111b49deb850a3dc7699c08251f5"
+checksum = "c441e177922bc58f1e12c022624b6216378e5febc2f0533e41ba443d505b80aa"
 dependencies = [
  "quote",
  "wasm-bindgen-macro-support",
@@ -2692,9 +2705,9 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-macro-support"
-version = "0.2.80"
+version = "0.2.81"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "99ec0dc7a4756fffc231aab1b9f2f578d23cd391390ab27f952ae0c9b3ece20b"
+checksum = "7d94ac45fcf608c1f45ef53e748d35660f168490c10b23704c7779ab8f5c3048"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -2705,15 +2718,15 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-shared"
-version = "0.2.80"
+version = "0.2.81"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d554b7f530dee5964d9a9468d95c1f8b8acae4f282807e7d27d4b03099a46744"
+checksum = "6a89911bd99e5f3659ec4acf9c4d93b0a90fe4a2a11f15328472058edc5261be"
 
 [[package]]
 name = "web-sys"
-version = "0.3.57"
+version = "0.3.58"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7b17e741662c70c8bd24ac5c5b18de314a2c26c32bf8346ee1e6f53de919c283"
+checksum = "2fed94beee57daf8dd7d51f2b15dc2bcde92d7a72304cdf662a4371008b71b90"
 dependencies = [
  "js-sys",
  "wasm-bindgen",
diff --git a/mps-interpreter/fuzz/.gitignore b/mps-interpreter/fuzz/.gitignore
new file mode 100644
index 0000000..a092511
--- /dev/null
+++ b/mps-interpreter/fuzz/.gitignore
@@ -0,0 +1,3 @@
+target
+corpus
+artifacts
diff --git a/mps-interpreter/fuzz/Cargo.lock b/mps-interpreter/fuzz/Cargo.lock
new file mode 100644
index 0000000..654cbc4
--- /dev/null
+++ b/mps-interpreter/fuzz/Cargo.lock
@@ -0,0 +1,1342 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "adler"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
+
+[[package]]
+name = "ahash"
+version = "0.7.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fcb51a0695d8f838b1ee009b3fbf66bda078cd64590202a864a8f3e8c4315c47"
+dependencies = [
+ "getrandom",
+ "once_cell",
+ "version_check",
+]
+
+[[package]]
+name = "aho-corasick"
+version = "0.7.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e37cfd5e7657ada45f742d6e99ca5788580b5c529dc78faf11ece6dc702656f"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "arbitrary"
+version = "1.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5a7924531f38b1970ff630f03eb20a2fde69db5c590c93b0f3482e95dcc5fd60"
+
+[[package]]
+name = "arrayvec"
+version = "0.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8da52d66c7071e2e3fa2a1e5c6d088fec47b593032b254f5e980de8ea54454d6"
+
+[[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"
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diff --git a/mps-interpreter/fuzz/Cargo.toml b/mps-interpreter/fuzz/Cargo.toml
new file mode 100644
index 0000000..d887d27
--- /dev/null
+++ b/mps-interpreter/fuzz/Cargo.toml
@@ -0,0 +1,25 @@
+[package]
+name = "mps-interpreter-fuzz"
+version = "0.0.0"
+authors = ["Automatically generated"]
+publish = false
+edition = "2018"
+
+[package.metadata]
+cargo-fuzz = true
+
+[dependencies]
+libfuzzer-sys = "0.4"
+
+[dependencies.mps-interpreter]
+path = ".."
+
+# Prevent this from interfering with workspaces
+[workspace]
+members = ["."]
+
+[[bin]]
+name = "faye_fuzz"
+path = "fuzz_targets/faye_fuzz.rs"
+test = false
+doc = false
diff --git a/mps-interpreter/fuzz/fuzz_targets/faye_fuzz.rs b/mps-interpreter/fuzz/fuzz_targets/faye_fuzz.rs
new file mode 100644
index 0000000..37f7a94
--- /dev/null
+++ b/mps-interpreter/fuzz/fuzz_targets/faye_fuzz.rs
@@ -0,0 +1,20 @@
+#![no_main]
+#[macro_use] extern crate libfuzzer_sys;
+extern crate mps_interpreter;
+
+fuzz_target!(|data: &[u8]| {
+    if let Ok(s) = std::str::from_utf8(data) {
+        print!("len:{},data:{}\n", data.len(), s)
+    } else {
+        print!("len:{},data:<non-ut8>,", data.len());
+    }
+    let mut cursor = std::io::Cursor::new(data);
+    let interpreter = mps_interpreter::MpsFaye::with_stream(&mut cursor);
+    for item in interpreter {
+        match item {
+            Err(e) => print!("err:{},", e),
+            Ok(i) => print!("item:{},", i),
+        }
+    }
+    println!("done.");
+});
diff --git a/mps-interpreter/src/lang/filter.rs b/mps-interpreter/src/lang/filter.rs
index 378245b..15445f1 100644
--- a/mps-interpreter/src/lang/filter.rs
+++ b/mps-interpreter/src/lang/filter.rs
@@ -55,6 +55,7 @@ pub struct MpsFilterStatement<P: MpsFilterPredicate + 'static> {
     iterable: VariableOrOp,
     context: Option<MpsContext>,
     other_filters: Option<PseudoOp>,
+    is_failing: bool,
 }
 
 impl<P: MpsFilterPredicate + 'static> std::clone::Clone for MpsFilterStatement<P> {
@@ -64,6 +65,7 @@ impl<P: MpsFilterPredicate + 'static> std::clone::Clone for MpsFilterStatement<P
             iterable: self.iterable.clone(),
             context: None,
             other_filters: self.other_filters.clone(),
+            is_failing: self.is_failing,
         }
     }
 }
@@ -119,6 +121,7 @@ impl<P: MpsFilterPredicate + 'static> MpsOp for MpsFilterStatement<P> {
 
     fn reset(&mut self) -> Result<(), RuntimeError> {
         let fake = PseudoOp::Fake(format!("{}", self));
+        self.is_failing = false;
         self.predicate
             .reset()
             .map_err(|x| x.with(RuntimeOp(fake.clone())))?;
@@ -189,6 +192,7 @@ impl<P: MpsFilterPredicate + 'static> MpsOp for MpsFilterStatement<P> {
                 .other_filters
                 .as_ref()
                 .map(|x| PseudoOp::from(x.try_real_ref().unwrap().dup())),
+            is_failing: false,
         })
     }
 }
@@ -197,11 +201,11 @@ impl<P: MpsFilterPredicate + 'static> Iterator for MpsFilterStatement<P> {
     type Item = MpsIteratorItem;
 
     fn next(&mut self) -> Option<Self::Item> {
-        if self.predicate.is_complete() && self.other_filters.is_none() {
+        if (self.predicate.is_complete() && self.other_filters.is_none()) || self.is_failing {
             return None;
         }
-        let self_clone = self.clone();
-        let self_clone2 = self_clone.clone();
+        //let self_clone = self.clone();
+        //let self_clone2 = self_clone.clone();
         let fake = PseudoOp::Fake(format!("{}", self));
         //let ctx = self.context.as_mut().unwrap();
         match &mut self.iterable {
@@ -319,14 +323,17 @@ impl<P: MpsFilterPredicate + 'static> Iterator for MpsFilterStatement<P> {
                     Ok(x) => {
                         return Some(Err(RuntimeError {
                             line: 0,
-                            op: (Box::new(self_clone2) as Box<dyn MpsOp>).into(),
+                            op: fake,
                             msg: format!(
                                 "Expected operation/iterable type in variable {}, got {}",
                                 &variable_name, x
                             ),
                         }))
                     }
-                    Err(e) => return Some(Err(e.with(RuntimeOp(fake.clone())))),
+                    Err(e) => {
+                        self.is_failing = true; // this is unrecoverable and reproducible, so it shouldn't be tried again (to prevent error spam)
+                        return Some(Err(e.with(RuntimeOp(fake.clone()))))
+                    },
                 };
                 let mut maybe_result = None;
                 let ctx = self.context.take().unwrap();
@@ -610,6 +617,7 @@ impl<P: MpsFilterPredicate + 'static, F: MpsFilterFactory<P> + 'static> BoxedMps
                 iterable: op,
                 context: None,
                 other_filters: another_filter,
+                is_failing: false,
             }))
         }
     }
diff --git a/mps-interpreter/src/lang/vocabulary/variable_assign.rs b/mps-interpreter/src/lang/vocabulary/variable_assign.rs
index d5b99e4..2c39f05 100644
--- a/mps-interpreter/src/lang/vocabulary/variable_assign.rs
+++ b/mps-interpreter/src/lang/vocabulary/variable_assign.rs
@@ -21,6 +21,7 @@ pub struct AssignStatement {
     context: Option<MpsContext>,
     is_declaration: bool,
     is_simple: bool,
+    is_tried: bool,
 }
 
 impl Display for AssignStatement {
@@ -42,6 +43,7 @@ impl std::clone::Clone for AssignStatement {
             context: None,
             is_declaration: self.is_declaration,
             is_simple: self.is_simple,
+            is_tried: self.is_tried,
         }
     }
 }
@@ -50,6 +52,11 @@ impl Iterator for AssignStatement {
     type Item = MpsIteratorItem;
 
     fn next(&mut self) -> Option<Self::Item> {
+        if self.is_tried {
+            return None;
+        } else {
+            self.is_tried = true;
+        }
         if let Some(inner_statement) = &mut self.inner_statement {
             if inner_statement.is_fake() {
                 Some(Err(RuntimeError {
@@ -148,6 +155,7 @@ impl MpsOp for AssignStatement {
             context: None,
             is_declaration: self.is_declaration,
             is_simple: self.is_simple,
+            is_tried: false,
         })
     }
 }
@@ -195,6 +203,7 @@ impl MpsOpFactory<AssignStatement> for AssignStatementFactory {
                 context: None,
                 is_declaration: is_decl,
                 is_simple: true,
+                is_tried: false,
             })
         } else {
             let inner_statement = dict.try_build_statement(tokens)?;
@@ -205,6 +214,7 @@ impl MpsOpFactory<AssignStatement> for AssignStatementFactory {
                 context: None,
                 is_declaration: is_decl,
                 is_simple: false,
+                is_tried: false,
             })
         }
     }