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gleam_stdlib gen src gleam@pair.erl
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gen/src/gleam@pair.erl

-module(gleam@pair).
-compile(no_auto_import).
-export([first/1, second/1, swap/1, map_first/2, map_second/2]).
-spec first({M, any()}) -> M.
first(Pair) ->
{A, _} = Pair,
A.
-spec second({any(), P}) -> P.
second(Pair) ->
{_, A} = Pair,
A.
-spec swap({Q, R}) -> {R, Q}.
swap(Pair) ->
{A, B} = Pair,
{B, A}.
-spec map_first({S, T}, fun((S) -> U)) -> {U, T}.
map_first(Pair, Fun) ->
{A, B} = Pair,
{Fun(A), B}.
-spec map_second({V, W}, fun((W) -> X)) -> {V, X}.
map_second(Pair, Fun) ->
{A, B} = Pair,
{A, Fun(B)}.