chore: Switch to using an enum

Author: spotandjake

stdlib/number.gr

@@ -30,6 +30,9 @@ include "runtime/atof/parse" as Atof
 include "runtime/unsafe/tags"
 include "runtime/exception"
 
+from Atoi use { type ParseIntError }
+
+provide { type ParseIntError }
 /**
  * Pi represented as a Number value.
  *

stdlib/number.md

@@ -13,6 +13,22 @@ No other changes yet.
 include "number"
 ```
 
+## Types
+
+Type declarations included in the Number module.
+
+### Number.**ParseIntError**
+
+```grain
+enum ParseIntError {
+  EmptyString,
+  InvalidDigit,
+  InvalidRadix,
+}
+```
+
+Represents an error that can occur when parsing ints.
+
 ## Values
 
 Functions and constants included in the Number module.
@@ -709,7 +725,8 @@ No other changes yet.
 </details>
 
 ```grain
-parseInt : (string: String, radix: Number) => Result<Number, Exception>
+parseInt :
+  (string: String, radix: Number) => Result<Number, Atoi.ParseIntError>
 ```
 
 Parses a string representation of an integer into a `Number` using the
@@ -731,7 +748,7 @@ Returns:
 
 |type|description|
 |----|-----------|
-|`Result<Number, Exception>`|`Ok(value)` containing the parsed number on a successful parse or `Err(msg)` containing an error message string otherwise|
+|`Result<Number, Atoi.ParseIntError>`|`Ok(value)` containing the parsed number on a successful parse or `Err(msg)` containing an error message string otherwise|
 
 ### Number.**parseFloat**
 
@@ -767,7 +784,7 @@ No other changes yet.
 </details>
 
 ```grain
-parse : (input: String) => Result<Number, Exception>
+parse : (input: String) => Result<Number, Atoi.ParseIntError>
 ```
 
 Parses a string representation of an integer, float, or rational into a `Number`.
@@ -783,7 +800,7 @@ Returns:
 
 |type|description|
 |----|-----------|
-|`Result<Number, Exception>`|`Ok(value)` containing the parsed number on a successful parse or `Err(msg)` containing an error message string otherwise|
+|`Result<Number, Atoi.ParseIntError>`|`Ok(value)` containing the parsed number on a successful parse or `Err(msg)` containing an error message string otherwise|
 
 ### Number.**sin**
 

stdlib/runtime/atoi/parse.gr

@@ -20,9 +20,14 @@ include "runtime/bigint" as BI
 include "runtime/numbers"
 from Numbers use { reducedInteger }
 
-provide exception EmptyString
-provide exception InvalidDigit
-provide exception InvalidRadix
+/**
+ * Represents an error that can occur when parsing ints.
+ */
+provide enum ParseIntError {
+  EmptyString,
+  InvalidDigit,
+  InvalidRadix,
+}
 
 primitive (&&) = "@and"
 primitive (||) = "@or"

stdlib/runtime/atoi/parse.md

@@ -2,13 +2,29 @@
 title: Parse
 ---
 
+## Types
+
+Type declarations included in the Parse module.
+
+### Parse.**ParseIntError**
+
+```grain
+enum ParseIntError {
+  EmptyString,
+  InvalidDigit,
+  InvalidRadix,
+}
+```
+
+Represents an error that can occur when parsing ints.
+
 ## Values
 
 Functions and constants included in the Parse module.
 
 ### Parse.**parseInt**
 
 ```grain
-parseInt : (string: String, radix: Number) => Result<Number, Exception>
+parseInt : (string: String, radix: Number) => Result<Number, ParseIntError>
 ```