gleam-lang/gleam
Invalid JavaScript generated for case in a pipeline
Closed
#5,743 opened on May 22, 2026
help wantedhigh priority
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Description
- gleam 1.16.0
- target JS
This code gets compiled to an invalid JS file.
import gleam/function
import gleam/io
pub fn main() {
0
|> case True {
True -> function.identity |> echo
False -> fn(i) { i + 1 }
}
|> fn(i) { i + 1 }
}
Compiled to a JS file with this error:
SyntaxError: Identifier '_pipe$1' has already been declared
export function main() {
let _pipe = 0;
let _block;
let $ = true;
let _pipe$1 = $function.identity;
_block = echo(_pipe$1, undefined, "src/tmp_gleam.gleam", 7);
let _pipe$1 = _block(_pipe);
return ((i) => { return i + 1; })(_pipe$1);
}