Remove result.guard

Author: lpil

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 ## Unreleased
 
-- Updated for Gleam v0.27.0.
+- The `bool` module gains the `guard` function.
 - Fixed a bug where `io.print`, `io.print_error`, and `io.print_debug` would use 
   `console.log` and add `"\n"` to the output when running on Deno.
 - Fixed a bug where `int.floor_divide` would return the wrong result in certain

src/gleam/result.gleam

@@ -411,36 +411,3 @@ pub fn replace_error(result: Result(a, e1), error: e2) -> Result(a, e2) {
 pub fn values(results: List(Result(a, e))) -> List(a) {
   list.filter_map(results, fn(r) { r })
 }
-
-/// Run a callback function if the given bool is `True`, otherwise return a
-/// default error value.
-///
-/// This function is suitable for `use` expressions.
-///
-/// ## Examples
-///
-/// ```gleam
-/// > let name = "Kamaka"
-/// > use <- guard(name != "", or: "Missing name")
-/// > Ok("Hello, " <> name)
-/// Ok("Hello, Kamaka")
-/// ```
-///
-/// ```gleam
-/// > let name = ""
-/// > use <- guard(name != "", or: "Missing name")
-/// > Ok("Hello, " <> name)
-/// Error("Missing name")
-/// ```
-///
-///
-pub fn guard(
-  requirement: Bool,
-  or error: e,
-  then consequence: fn() -> Result(a, e),
-) -> Result(a, e) {
-  case requirement {
-    True -> consequence()
-    False -> Error(error)
-  }
-}

test/gleam/result_test.gleam

@@ -205,17 +205,3 @@ pub fn values_test() {
   result.values([Ok(1), Error(""), Ok(3)])
   |> should.equal([1, 3])
 }
-
-pub fn guard_test() {
-  assert Ok(1) = {
-    let x = 1
-    use <- result.guard(True, or: "nope")
-    Ok(x)
-  }
-
-  assert Error("nope") = {
-    let x = 1
-    use <- result.guard(False, or: "nope")
-    Ok(x)
-  }
-}