Merge branch 'trunk' into str_trim

compiler/builtins/docs/List.roc

@@ -34,6 +34,7 @@ interface List
             sortWith,
             drop,
             dropAt,
+            dropLast,
             swap
         ]
     imports []
@@ -439,6 +440,9 @@ drop : List elem, Nat -> List elem
 ## To replace the element at a given index, instead of dropping it, see [List.set].
 dropAt : List elem, Nat -> List elem
 
+## Drops the last element in a List.
+dropLast : List elem -> List elem
+
 ## Adds a new element to the end of the list.
 ##
 ## >>> List.append [ "a", "b" ] "c"

compiler/builtins/src/std.rs

@@ -937,6 +937,13 @@ pub fn types() -> MutMap<Symbol, (SolvedType, Region)> {
         Box::new(list_type(flex(TVAR1))),
     );
 
+    // dropLast : List elem -> List elem
+    add_top_level_function_type!(
+        Symbol::LIST_DROP_LAST,
+        vec![list_type(flex(TVAR1))],
+        Box::new(list_type(flex(TVAR1))),
+    );
+
     // swap : List elem, Nat, Nat -> List elem
     add_top_level_function_type!(
         Symbol::LIST_SWAP,