error: unexpected double bind at 4..6
NODE_ROOT@0..10
NODE_LAMBDA@0..10
NODE_PATTERN@0..6
NODE_PAT_BIND@0..2
NODE_IDENT@0..1
TOKEN_IDENT@0..1 "f"
TOKEN_AT@1..2 "@"
TOKEN_L_BRACE@2..3 "{"
TOKEN_R_BRACE@3..4 "}"
NODE_ERROR@4..6
TOKEN_AT@4..5 "@"
NODE_IDENT@5..6
TOKEN_IDENT@5..6 "f"
TOKEN_COLON@6..7 ":"
TOKEN_WHITESPACE@7..8 "\n"
NODE_STRING@8..10
TOKEN_STRING_START@8..9 "\""
TOKEN_STRING_END@9..10 "\""