Merge pull request #321 from quantified-uncertainty/cauchy

hotfix: `cauchy` in binary dist constructors

packages/squiggle-lang/.prettierignore

@@ -2,3 +2,5 @@ dist
 lib
 *.bs.js
 *.gen.tsx
+.nyc_output/
+coverage/

packages/squiggle-lang/src/rescript/Distributions/SymbolicDist/SymbolicDist.res

@@ -86,7 +86,9 @@ module Exponential = {
 
 module Cauchy = {
   type t = cauchy
-  let make = (local, scale): symbolicDist => #Cauchy({local: local, scale: scale})
+  let make = (local, scale): result<symbolicDist, string> => Ok(
+    #Cauchy({local: local, scale: scale}),
+  )
   let pdf = (x, t: t) => Jstat.Cauchy.pdf(x, t.local, t.scale)
   let cdf = (x, t: t) => Jstat.Cauchy.cdf(x, t.local, t.scale)
   let inv = (p, t: t) => Jstat.Cauchy.inv(p, t.local, t.scale)

packages/squiggle-lang/src/rescript/ReducerInterface/ReducerInterface_GenericDistribution.res

@@ -149,6 +149,7 @@ module SymbolicConstructors = {
     | "uniform" => Ok(SymbolicDist.Uniform.make)
     | "beta" => Ok(SymbolicDist.Beta.make)
     | "lognormal" => Ok(SymbolicDist.Lognormal.make)
+    | "cauchy" => Ok(SymbolicDist.Cauchy.make)
     | "to" => Ok(SymbolicDist.From90thPercentile.make)
     | _ => Error("Unreachable state")
     }
@@ -182,7 +183,7 @@ let dispatchToGenericOutput = (call: ExpressionValue.functionCall): option<
     ->E.R.bind(r => r(f1))
     ->SymbolicConstructors.symbolicResultToOutput
   | (
-      ("normal" | "uniform" | "beta" | "lognormal" | "to") as fnName,
+      ("normal" | "uniform" | "beta" | "lognormal" | "cauchy" | "to") as fnName,
       [EvNumber(f1), EvNumber(f2)],
     ) =>
     SymbolicConstructors.twoFloat(fnName)