From 92e0a22e24b9634d068a8e9efbe0c5f588de8411 Mon Sep 17 00:00:00 2001
From: Alex Bethel <abethel@cs.nmt.edu>
Date: Sat, 12 Jun 2021 10:45:25 -0500
Subject: [PATCH 1/3] Integrate `const.rs` as `consts`

---
 src/{const.rs => consts.rs} | 0
 src/main.rs                 | 1 +
 2 files changed, 1 insertion(+)
 rename src/{const.rs => consts.rs} (100%)

diff --git a/src/const.rs b/src/consts.rs
similarity index 100%
rename from src/const.rs
rename to src/consts.rs
diff --git a/src/main.rs b/src/main.rs
index 847fa2e..0b7f257 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -3,6 +3,7 @@
 mod ast;
 mod base_55;
 mod brian;
+mod consts;
 mod error;
 mod interpret;
 mod lexer;

From da9ff64486826e305c7f6bd57c20d37c0389519f Mon Sep 17 00:00:00 2001
From: Alex Bethel <abethel@cs.nmt.edu>
Date: Sat, 12 Jun 2021 10:48:44 -0500
Subject: [PATCH 2/3] Make arithmetic errors evaluate to 42

---
 src/error.rs     | 1 -
 src/interpret.rs | 7 ++-----
 2 files changed, 2 insertions(+), 6 deletions(-)

diff --git a/src/error.rs b/src/error.rs
index b1da312..8d430f5 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -18,7 +18,6 @@ pub enum ErrorKind {
     MeloVariable(String),
     TypeError(String),
     TopLevelBreak,
-    ArithmeticError,
     BfInterpretError(InterpretError),
     MissingLhs,
 }
diff --git a/src/interpret.rs b/src/interpret.rs
index eb6bb2e..27dd2b1 100644
--- a/src/interpret.rs
+++ b/src/interpret.rs
@@ -19,7 +19,7 @@ use rand::random;
 
 use crate::{
     ast::{Expr, Iden, Stmt, StmtKind},
-    base_55,
+    base_55, consts,
     error::{Error, ErrorKind},
     variables::{Functio, Value, Variable},
 };
@@ -134,10 +134,7 @@ impl ExecEnv {
                             Divide => lhs.checked_div(rhs),
                             _ => unreachable!(),
                         }
-                        .ok_or(Error {
-                            kind: ErrorKind::ArithmeticError,
-                            span: expr.span.clone(),
-                        })?;
+                        .unwrap_or(consts::ANSWER);
                         Int(res)
                     }
 

From d1064802ec82ebbafb60e240eb5245aa6f8faddb Mon Sep 17 00:00:00 2001
From: Alex Bethel <abethel@cs.nmt.edu>
Date: Tue, 15 Jun 2021 11:29:52 -0500
Subject: [PATCH 3/3] Fix unit tests

---
 src/interpret.rs | 20 ++++++++------------
 1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/src/interpret.rs b/src/interpret.rs
index 27dd2b1..da0560a 100644
--- a/src/interpret.rs
+++ b/src/interpret.rs
@@ -442,7 +442,7 @@ mod tests {
         // Integer overflow should throw a recoverable error instead
         // of panicking.
         let env = ExecEnv::new();
-        assert!(matches!(
+        assert_eq!(
             env.eval_expr(&Expr {
                 kind: ExprKind::BinOp {
                     lhs: Box::new(Expr {
@@ -456,15 +456,13 @@ mod tests {
                     kind: crate::ast::BinOpKind::Add,
                 },
                 span: 1..1
-            }),
-            Err(Error {
-                kind: ErrorKind::ArithmeticError,
-                span: _,
             })
-        ));
+            .unwrap(),
+            Value::Int(42)
+        );
 
         // And the same for divide by zero.
-        assert!(matches!(
+        assert_eq!(
             env.eval_expr(&Expr {
                 kind: ExprKind::BinOp {
                     lhs: Box::new(Expr {
@@ -478,12 +476,10 @@ mod tests {
                     kind: crate::ast::BinOpKind::Divide,
                 },
                 span: 1..1
-            }),
-            Err(Error {
-                kind: ErrorKind::ArithmeticError,
-                span: _,
             })
-        ));
+            .unwrap(),
+            Value::Int(42)
+        );
     }
 
     // From here on out, I'll use this function to parse and run