From 9cf3a93b70e56b789a38e5218dade68934a632ce Mon Sep 17 00:00:00 2001
From: Umur Ozkul <umur@hightechmind.io>
Date: Tue, 23 Aug 2022 11:47:24 +0200
Subject: [PATCH] fix parseInludes bug

---
 .../ReducerProject_IncludeParser.js           | 328 +++++++-----------
 .../ReducerProject_IncludeParser.peggy        |   5 +-
 .../ReducerProject_ParseIncludes.res          |  13 +-
 .../ReducerProject_ProjectItem.res            |   2 +-
 4 files changed, 145 insertions(+), 203 deletions(-)

diff --git a/packages/squiggle-lang/src/rescript/ReducerProject/ReducerProject_IncludeParser.js b/packages/squiggle-lang/src/rescript/ReducerProject/ReducerProject_IncludeParser.js
index cb8c66eb..e04b8ba2 100644
--- a/packages/squiggle-lang/src/rescript/ReducerProject/ReducerProject_IncludeParser.js
+++ b/packages/squiggle-lang/src/rescript/ReducerProject/ReducerProject_IncludeParser.js
@@ -5,9 +5,7 @@
 "use strict";
 
 function peg$subclass(child, parent) {
-  function C() {
-    this.constructor = child;
-  }
+  function C() { this.constructor = child; }
   C.prototype = parent.prototype;
   child.prototype = new C();
 }
@@ -29,15 +27,13 @@ peg$subclass(peg$SyntaxError, Error);
 
 function peg$padEnd(str, targetLength, padString) {
   padString = padString || " ";
-  if (str.length > targetLength) {
-    return str;
-  }
+  if (str.length > targetLength) { return str; }
   targetLength -= str.length;
   padString += padString.repeat(targetLength);
   return str + padString.slice(0, targetLength);
 }
 
-peg$SyntaxError.prototype.format = function (sources) {
+peg$SyntaxError.prototype.format = function(sources) {
   var str = "Error: " + this.message;
   if (this.location) {
     var src = null;
@@ -52,24 +48,15 @@ peg$SyntaxError.prototype.format = function (sources) {
     var loc = this.location.source + ":" + s.line + ":" + s.column;
     if (src) {
       var e = this.location.end;
-      var filler = peg$padEnd("", s.line.toString().length, " ");
+      var filler = peg$padEnd("", s.line.toString().length, ' ');
       var line = src[s.line - 1];
       var last = s.line === e.line ? e.column : line.length + 1;
-      var hatLen = last - s.column || 1;
-      str +=
-        "\n --> " +
-        loc +
-        "\n" +
-        filler +
-        " |\n" +
-        s.line +
-        " | " +
-        line +
-        "\n" +
-        filler +
-        " | " +
-        peg$padEnd("", s.column - 1, " ") +
-        peg$padEnd("", hatLen, "^");
+      var hatLen = (last - s.column) || 1;
+      str += "\n --> " + loc + "\n"
+          + filler + " |\n"
+          + s.line + " | " + line + "\n"
+          + filler + " | " + peg$padEnd("", s.column - 1, ' ')
+          + peg$padEnd("", hatLen, "^");
     } else {
       str += "\n at " + loc;
     }
@@ -77,35 +64,33 @@ peg$SyntaxError.prototype.format = function (sources) {
   return str;
 };
 
-peg$SyntaxError.buildMessage = function (expected, found) {
+peg$SyntaxError.buildMessage = function(expected, found) {
   var DESCRIBE_EXPECTATION_FNS = {
-    literal: function (expectation) {
-      return '"' + literalEscape(expectation.text) + '"';
+    literal: function(expectation) {
+      return "\"" + literalEscape(expectation.text) + "\"";
     },
 
-    class: function (expectation) {
-      var escapedParts = expectation.parts.map(function (part) {
+    class: function(expectation) {
+      var escapedParts = expectation.parts.map(function(part) {
         return Array.isArray(part)
           ? classEscape(part[0]) + "-" + classEscape(part[1])
           : classEscape(part);
       });
 
-      return (
-        "[" + (expectation.inverted ? "^" : "") + escapedParts.join("") + "]"
-      );
+      return "[" + (expectation.inverted ? "^" : "") + escapedParts.join("") + "]";
     },
 
-    any: function () {
+    any: function() {
       return "any character";
     },
 
-    end: function () {
+    end: function() {
       return "end of input";
     },
 
-    other: function (expectation) {
+    other: function(expectation) {
       return expectation.description;
-    },
+    }
   };
 
   function hex(ch) {
@@ -115,17 +100,13 @@ peg$SyntaxError.buildMessage = function (expected, found) {
   function literalEscape(s) {
     return s
       .replace(/\\/g, "\\\\")
-      .replace(/"/g, '\\"')
+      .replace(/"/g,  "\\\"")
       .replace(/\0/g, "\\0")
       .replace(/\t/g, "\\t")
       .replace(/\n/g, "\\n")
       .replace(/\r/g, "\\r")
-      .replace(/[\x00-\x0F]/g, function (ch) {
-        return "\\x0" + hex(ch);
-      })
-      .replace(/[\x10-\x1F\x7F-\x9F]/g, function (ch) {
-        return "\\x" + hex(ch);
-      });
+      .replace(/[\x00-\x0F]/g,          function(ch) { return "\\x0" + hex(ch); })
+      .replace(/[\x10-\x1F\x7F-\x9F]/g, function(ch) { return "\\x"  + hex(ch); });
   }
 
   function classEscape(s) {
@@ -133,17 +114,13 @@ peg$SyntaxError.buildMessage = function (expected, found) {
       .replace(/\\/g, "\\\\")
       .replace(/\]/g, "\\]")
       .replace(/\^/g, "\\^")
-      .replace(/-/g, "\\-")
+      .replace(/-/g,  "\\-")
       .replace(/\0/g, "\\0")
       .replace(/\t/g, "\\t")
       .replace(/\n/g, "\\n")
       .replace(/\r/g, "\\r")
-      .replace(/[\x00-\x0F]/g, function (ch) {
-        return "\\x0" + hex(ch);
-      })
-      .replace(/[\x10-\x1F\x7F-\x9F]/g, function (ch) {
-        return "\\x" + hex(ch);
-      });
+      .replace(/[\x00-\x0F]/g,          function(ch) { return "\\x0" + hex(ch); })
+      .replace(/[\x10-\x1F\x7F-\x9F]/g, function(ch) { return "\\x"  + hex(ch); });
   }
 
   function describeExpectation(expectation) {
@@ -174,25 +151,17 @@ peg$SyntaxError.buildMessage = function (expected, found) {
         return descriptions[0] + " or " + descriptions[1];
 
       default:
-        return (
-          descriptions.slice(0, -1).join(", ") +
-          ", or " +
-          descriptions[descriptions.length - 1]
-        );
+        return descriptions.slice(0, -1).join(", ")
+          + ", or "
+          + descriptions[descriptions.length - 1];
     }
   }
 
   function describeFound(found) {
-    return found ? '"' + literalEscape(found) + '"' : "end of input";
+    return found ? "\"" + literalEscape(found) + "\"" : "end of input";
   }
 
-  return (
-    "Expected " +
-    describeExpected(expected) +
-    " but " +
-    describeFound(found) +
-    " found."
-  );
+  return "Expected " + describeExpected(expected) + " but " + describeFound(found) + " found.";
 };
 
 function peg$parse(input, options) {
@@ -206,7 +175,7 @@ function peg$parse(input, options) {
 
   var peg$c0 = "#include";
   var peg$c1 = "'";
-  var peg$c2 = '"';
+  var peg$c2 = "\"";
   var peg$c3 = "//";
   var peg$c4 = "/*";
   var peg$c5 = "*/";
@@ -222,8 +191,8 @@ function peg$parse(input, options) {
   var peg$e1 = peg$otherExpectation("string");
   var peg$e2 = peg$literalExpectation("'", false);
   var peg$e3 = peg$classExpectation(["'"], true, false);
-  var peg$e4 = peg$literalExpectation('"', false);
-  var peg$e5 = peg$classExpectation(['"'], true, false);
+  var peg$e4 = peg$literalExpectation("\"", false);
+  var peg$e5 = peg$classExpectation(["\""], true, false);
   var peg$e6 = peg$literalExpectation("//", false);
   var peg$e7 = peg$literalExpectation("/*", false);
   var peg$e8 = peg$classExpectation(["*"], true, false);
@@ -234,24 +203,12 @@ function peg$parse(input, options) {
   var peg$e13 = peg$classExpectation(["\n", "\r"], false, false);
   var peg$e14 = peg$classExpectation(["\r", "\n"], true, false);
 
-  var peg$f0 = function (head, tail) {
-    return [head, ...tail].filter((e) => e != "");
-  };
-  var peg$f1 = function () {
-    return [];
-  };
-  var peg$f2 = function (characters) {
-    return characters.join("");
-  };
-  var peg$f3 = function (characters) {
-    return characters.join("");
-  };
-  var peg$f4 = function () {
-    return "";
-  };
-  var peg$f5 = function () {
-    return "";
-  };
+  var peg$f0 = function(head, tail) {return [head, ...tail].filter( e => e != '');};
+  var peg$f1 = function() {return [];};
+  var peg$f2 = function(characters) {return characters.join('');};
+  var peg$f3 = function(characters) {return characters.join('');};
+  var peg$f4 = function() { return '';};
+  var peg$f5 = function() { return '';};
   var peg$currPos = 0;
   var peg$savedPos = 0;
   var peg$posDetailsCache = [{ line: 1, column: 1 }];
@@ -265,9 +222,7 @@ function peg$parse(input, options) {
 
   if ("startRule" in options) {
     if (!(options.startRule in peg$startRuleFunctions)) {
-      throw new Error(
-        "Can't start parsing from rule \"" + options.startRule + '".'
-      );
+      throw new Error("Can't start parsing from rule \"" + options.startRule + "\".");
     }
 
     peg$startRuleFunction = peg$startRuleFunctions[options.startRule];
@@ -285,7 +240,7 @@ function peg$parse(input, options) {
     return {
       source: peg$source,
       start: peg$savedPos,
-      end: peg$currPos,
+      end: peg$currPos
     };
   }
 
@@ -294,10 +249,9 @@ function peg$parse(input, options) {
   }
 
   function expected(description, location) {
-    location =
-      location !== undefined
-        ? location
-        : peg$computeLocation(peg$savedPos, peg$currPos);
+    location = location !== undefined
+      ? location
+      : peg$computeLocation(peg$savedPos, peg$currPos);
 
     throw peg$buildStructuredError(
       [peg$otherExpectation(description)],
@@ -307,10 +261,9 @@ function peg$parse(input, options) {
   }
 
   function error(message, location) {
-    location =
-      location !== undefined
-        ? location
-        : peg$computeLocation(peg$savedPos, peg$currPos);
+    location = location !== undefined
+      ? location
+      : peg$computeLocation(peg$savedPos, peg$currPos);
 
     throw peg$buildSimpleError(message, location);
   }
@@ -320,12 +273,7 @@ function peg$parse(input, options) {
   }
 
   function peg$classExpectation(parts, inverted, ignoreCase) {
-    return {
-      type: "class",
-      parts: parts,
-      inverted: inverted,
-      ignoreCase: ignoreCase,
-    };
+    return { type: "class", parts: parts, inverted: inverted, ignoreCase: ignoreCase };
   }
 
   function peg$anyExpectation() {
@@ -355,7 +303,7 @@ function peg$parse(input, options) {
       details = peg$posDetailsCache[p];
       details = {
         line: details.line,
-        column: details.column,
+        column: details.column
       };
 
       while (p < pos) {
@@ -384,20 +332,18 @@ function peg$parse(input, options) {
       start: {
         offset: startPos,
         line: startPosDetails.line,
-        column: startPosDetails.column,
+        column: startPosDetails.column
       },
       end: {
         offset: endPos,
         line: endPosDetails.line,
-        column: endPosDetails.column,
-      },
+        column: endPosDetails.column
+      }
     };
   }
 
   function peg$fail(expected) {
-    if (peg$currPos < peg$maxFailPos) {
-      return;
-    }
+    if (peg$currPos < peg$maxFailPos) { return; }
 
     if (peg$currPos > peg$maxFailPos) {
       peg$maxFailPos = peg$currPos;
@@ -421,7 +367,7 @@ function peg$parse(input, options) {
   }
 
   function peg$parsestart() {
-    var s0, s1, s2, s3;
+    var s0, s1, s2, s3, s4;
 
     var key = peg$currPos * 10 + 0;
     var cached = peg$resultsCache[key];
@@ -433,16 +379,40 @@ function peg$parse(input, options) {
     }
 
     s0 = peg$currPos;
-    s1 = peg$parseincludes();
-    if (s1 !== peg$FAILED) {
-      s2 = [];
-      s3 = peg$parsenewLine();
-      while (s3 !== peg$FAILED) {
-        s2.push(s3);
-        s3 = peg$parsenewLine();
+    s1 = [];
+    s2 = peg$parsenewLine();
+    if (s2 === peg$FAILED) {
+      s2 = peg$parse_();
+      if (s2 === peg$FAILED) {
+        s2 = peg$parsecomment();
+        if (s2 === peg$FAILED) {
+          s2 = peg$parsedelimitedComment();
+        }
       }
-      s3 = peg$parseignore();
-      s0 = s1;
+    }
+    while (s2 !== peg$FAILED) {
+      s1.push(s2);
+      s2 = peg$parsenewLine();
+      if (s2 === peg$FAILED) {
+        s2 = peg$parse_();
+        if (s2 === peg$FAILED) {
+          s2 = peg$parsecomment();
+          if (s2 === peg$FAILED) {
+            s2 = peg$parsedelimitedComment();
+          }
+        }
+      }
+    }
+    s2 = peg$parseincludes();
+    if (s2 !== peg$FAILED) {
+      s3 = [];
+      s4 = peg$parsenewLine();
+      while (s4 !== peg$FAILED) {
+        s3.push(s4);
+        s4 = peg$parsenewLine();
+      }
+      s4 = peg$parseignore();
+      s0 = s2;
     } else {
       peg$currPos = s0;
       s0 = peg$FAILED;
@@ -538,7 +508,7 @@ function peg$parse(input, options) {
   }
 
   function peg$parseincludeStatement() {
-    var s0, s1, s2, s3, s4, s5;
+    var s0, s1, s2, s3, s4, s5, s6;
 
     var key = peg$currPos * 10 + 2;
     var cached = peg$resultsCache[key];
@@ -550,31 +520,35 @@ function peg$parse(input, options) {
     }
 
     s0 = peg$currPos;
+    s1 = [];
+    s2 = peg$parse_();
+    while (s2 !== peg$FAILED) {
+      s1.push(s2);
+      s2 = peg$parse_();
+    }
     if (input.substr(peg$currPos, 8) === peg$c0) {
-      s1 = peg$c0;
+      s2 = peg$c0;
       peg$currPos += 8;
     } else {
-      s1 = peg$FAILED;
-      if (peg$silentFails === 0) {
-        peg$fail(peg$e0);
-      }
+      s2 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e0); }
     }
-    if (s1 !== peg$FAILED) {
-      s2 = [];
-      s3 = peg$parse_();
-      while (s3 !== peg$FAILED) {
-        s2.push(s3);
-        s3 = peg$parse_();
+    if (s2 !== peg$FAILED) {
+      s3 = [];
+      s4 = peg$parse_();
+      while (s4 !== peg$FAILED) {
+        s3.push(s4);
+        s4 = peg$parse_();
       }
-      s3 = peg$parsestring();
-      if (s3 !== peg$FAILED) {
-        s4 = [];
-        s5 = peg$parse_();
-        while (s5 !== peg$FAILED) {
-          s4.push(s5);
-          s5 = peg$parse_();
+      s4 = peg$parsestring();
+      if (s4 !== peg$FAILED) {
+        s5 = [];
+        s6 = peg$parse_();
+        while (s6 !== peg$FAILED) {
+          s5.push(s6);
+          s6 = peg$parse_();
         }
-        s0 = s3;
+        s0 = s4;
       } else {
         peg$currPos = s0;
         s0 = peg$FAILED;
@@ -615,9 +589,7 @@ function peg$parse(input, options) {
       peg$currPos++;
     } else {
       s2 = peg$FAILED;
-      if (peg$silentFails === 0) {
-        peg$fail(peg$e2);
-      }
+      if (peg$silentFails === 0) { peg$fail(peg$e2); }
     }
     if (s2 !== peg$FAILED) {
       s3 = [];
@@ -626,9 +598,7 @@ function peg$parse(input, options) {
         peg$currPos++;
       } else {
         s4 = peg$FAILED;
-        if (peg$silentFails === 0) {
-          peg$fail(peg$e3);
-        }
+        if (peg$silentFails === 0) { peg$fail(peg$e3); }
       }
       while (s4 !== peg$FAILED) {
         s3.push(s4);
@@ -637,9 +607,7 @@ function peg$parse(input, options) {
           peg$currPos++;
         } else {
           s4 = peg$FAILED;
-          if (peg$silentFails === 0) {
-            peg$fail(peg$e3);
-          }
+          if (peg$silentFails === 0) { peg$fail(peg$e3); }
         }
       }
       if (input.charCodeAt(peg$currPos) === 39) {
@@ -647,9 +615,7 @@ function peg$parse(input, options) {
         peg$currPos++;
       } else {
         s4 = peg$FAILED;
-        if (peg$silentFails === 0) {
-          peg$fail(peg$e2);
-        }
+        if (peg$silentFails === 0) { peg$fail(peg$e2); }
       }
       if (s4 !== peg$FAILED) {
         s1 = s3;
@@ -674,9 +640,7 @@ function peg$parse(input, options) {
         peg$currPos++;
       } else {
         s2 = peg$FAILED;
-        if (peg$silentFails === 0) {
-          peg$fail(peg$e4);
-        }
+        if (peg$silentFails === 0) { peg$fail(peg$e4); }
       }
       if (s2 !== peg$FAILED) {
         s3 = [];
@@ -685,9 +649,7 @@ function peg$parse(input, options) {
           peg$currPos++;
         } else {
           s4 = peg$FAILED;
-          if (peg$silentFails === 0) {
-            peg$fail(peg$e5);
-          }
+          if (peg$silentFails === 0) { peg$fail(peg$e5); }
         }
         while (s4 !== peg$FAILED) {
           s3.push(s4);
@@ -696,9 +658,7 @@ function peg$parse(input, options) {
             peg$currPos++;
           } else {
             s4 = peg$FAILED;
-            if (peg$silentFails === 0) {
-              peg$fail(peg$e5);
-            }
+            if (peg$silentFails === 0) { peg$fail(peg$e5); }
           }
         }
         if (input.charCodeAt(peg$currPos) === 34) {
@@ -706,9 +666,7 @@ function peg$parse(input, options) {
           peg$currPos++;
         } else {
           s4 = peg$FAILED;
-          if (peg$silentFails === 0) {
-            peg$fail(peg$e4);
-          }
+          if (peg$silentFails === 0) { peg$fail(peg$e4); }
         }
         if (s4 !== peg$FAILED) {
           s1 = s3;
@@ -729,9 +687,7 @@ function peg$parse(input, options) {
     peg$silentFails--;
     if (s0 === peg$FAILED) {
       s1 = peg$FAILED;
-      if (peg$silentFails === 0) {
-        peg$fail(peg$e1);
-      }
+      if (peg$silentFails === 0) { peg$fail(peg$e1); }
     }
 
     peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
@@ -793,9 +749,7 @@ function peg$parse(input, options) {
       peg$currPos += 2;
     } else {
       s1 = peg$FAILED;
-      if (peg$silentFails === 0) {
-        peg$fail(peg$e6);
-      }
+      if (peg$silentFails === 0) { peg$fail(peg$e6); }
     }
     if (s1 !== peg$FAILED) {
       s2 = [];
@@ -834,9 +788,7 @@ function peg$parse(input, options) {
       peg$currPos += 2;
     } else {
       s1 = peg$FAILED;
-      if (peg$silentFails === 0) {
-        peg$fail(peg$e7);
-      }
+      if (peg$silentFails === 0) { peg$fail(peg$e7); }
     }
     if (s1 !== peg$FAILED) {
       s2 = [];
@@ -845,9 +797,7 @@ function peg$parse(input, options) {
         peg$currPos++;
       } else {
         s3 = peg$FAILED;
-        if (peg$silentFails === 0) {
-          peg$fail(peg$e8);
-        }
+        if (peg$silentFails === 0) { peg$fail(peg$e8); }
       }
       while (s3 !== peg$FAILED) {
         s2.push(s3);
@@ -856,9 +806,7 @@ function peg$parse(input, options) {
           peg$currPos++;
         } else {
           s3 = peg$FAILED;
-          if (peg$silentFails === 0) {
-            peg$fail(peg$e8);
-          }
+          if (peg$silentFails === 0) { peg$fail(peg$e8); }
         }
       }
       if (input.substr(peg$currPos, 2) === peg$c5) {
@@ -866,9 +814,7 @@ function peg$parse(input, options) {
         peg$currPos += 2;
       } else {
         s3 = peg$FAILED;
-        if (peg$silentFails === 0) {
-          peg$fail(peg$e9);
-        }
+        if (peg$silentFails === 0) { peg$fail(peg$e9); }
       }
       if (s3 !== peg$FAILED) {
         peg$savedPos = s0;
@@ -905,16 +851,12 @@ function peg$parse(input, options) {
       peg$currPos++;
     } else {
       s0 = peg$FAILED;
-      if (peg$silentFails === 0) {
-        peg$fail(peg$e11);
-      }
+      if (peg$silentFails === 0) { peg$fail(peg$e11); }
     }
     peg$silentFails--;
     if (s0 === peg$FAILED) {
       s1 = peg$FAILED;
-      if (peg$silentFails === 0) {
-        peg$fail(peg$e10);
-      }
+      if (peg$silentFails === 0) { peg$fail(peg$e10); }
     }
 
     peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
@@ -940,16 +882,12 @@ function peg$parse(input, options) {
       peg$currPos++;
     } else {
       s0 = peg$FAILED;
-      if (peg$silentFails === 0) {
-        peg$fail(peg$e13);
-      }
+      if (peg$silentFails === 0) { peg$fail(peg$e13); }
     }
     peg$silentFails--;
     if (s0 === peg$FAILED) {
       s1 = peg$FAILED;
-      if (peg$silentFails === 0) {
-        peg$fail(peg$e12);
-      }
+      if (peg$silentFails === 0) { peg$fail(peg$e12); }
     }
 
     peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
@@ -974,9 +912,7 @@ function peg$parse(input, options) {
       peg$currPos++;
     } else {
       s0 = peg$FAILED;
-      if (peg$silentFails === 0) {
-        peg$fail(peg$e14);
-      }
+      if (peg$silentFails === 0) { peg$fail(peg$e14); }
     }
 
     peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
@@ -1005,5 +941,5 @@ function peg$parse(input, options) {
 
 module.exports = {
   SyntaxError: peg$SyntaxError,
-  parse: peg$parse,
+  parse: peg$parse
 };
diff --git a/packages/squiggle-lang/src/rescript/ReducerProject/ReducerProject_IncludeParser.peggy b/packages/squiggle-lang/src/rescript/ReducerProject/ReducerProject_IncludeParser.peggy
index 25d69b93..dc65fac4 100644
--- a/packages/squiggle-lang/src/rescript/ReducerProject/ReducerProject_IncludeParser.peggy
+++ b/packages/squiggle-lang/src/rescript/ReducerProject/ReducerProject_IncludeParser.peggy
@@ -3,9 +3,8 @@
 // #include "string"
 // #include "string2"
 
-
 start
-  = @includes newLine* ignore
+  = (newLine/_/comment/delimitedComment)* @includes newLine* ignore
 
 includes
  = head:includeStatement tail:(newLine+ @includeStatement)* 
@@ -14,7 +13,7 @@ includes
  {return [];}
 
 includeStatement
-  = '#include' _* @string _* 
+  = _* '#include' _* @string _* 
   / comment
   / delimitedComment
 
diff --git a/packages/squiggle-lang/src/rescript/ReducerProject/ReducerProject_ParseIncludes.res b/packages/squiggle-lang/src/rescript/ReducerProject/ReducerProject_ParseIncludes.res
index 347234a4..f6b17901 100644
--- a/packages/squiggle-lang/src/rescript/ReducerProject/ReducerProject_ParseIncludes.res
+++ b/packages/squiggle-lang/src/rescript/ReducerProject/ReducerProject_ParseIncludes.res
@@ -1,8 +1,15 @@
 @module("./ReducerProject_IncludeParser.js") external parse__: string => array<string> = "parse"
 
-let parseIncludes = (expr: string): array<string> =>
+let parseIncludes = (expr: string): result<array<string>, Reducer_ErrorValue.errorValue> =>
   try {
-    parse__(expr)
+    let answer = parse__(expr)
+    // let logEntry = answer->Js.Array2.joinWith(",")
+    // `parseIncludes: ${logEntry} for expr: ${expr}`->Js.log
+    answer->Ok
   } catch {
-  | Js.Exn.Error(_obj) => []
+  | Js.Exn.Error(obj) =>
+    RESyntaxError(
+      Belt.Option.getExn(Js.Exn.message(obj)),
+      Reducer_Peggy_Parse.syntaxErrorToLocation(obj)->Some,
+    )->Error
   }
diff --git a/packages/squiggle-lang/src/rescript/ReducerProject/ReducerProject_ProjectItem.res b/packages/squiggle-lang/src/rescript/ReducerProject/ReducerProject_ProjectItem.res
index 047937f1..2608e344 100644
--- a/packages/squiggle-lang/src/rescript/ReducerProject/ReducerProject_ProjectItem.res
+++ b/packages/squiggle-lang/src/rescript/ReducerProject/ReducerProject_ProjectItem.res
@@ -106,7 +106,7 @@ let setIncludes = (T.ProjectItem(r): t, includes: T.includesType): t => T.Projec
 
 //TODO: forward parse errors to the user
 let parseIncludes = (this: t): t =>
-  setIncludes(this, getSource(this)->ReducerProject_ParseIncludes.parseIncludes->Ok)
+  setIncludes(this, getSource(this)->ReducerProject_ParseIncludes.parseIncludes)
 
 let doRawParse = (this: t): T.rawParseArgumentType => this->getSource->Reducer_Peggy_Parse.parse