Unused lifetime in params when is-copy = false

[LouisGariepy]

Migrated from halcyonnouveau/clorinde#257, originally reported by @SinnySupernova on 2026-05-09.

Describe the bug

I'm mapping pgvector and having compiler tell me about unsed lifetime:

error[E0392]: lifetime parameter `'a` is never used
 --> crates/clorinde/src/queries/repro.rs:4:32
  |
4 | pub struct SearchVectorsParams<'a> {
  |                                ^^ unused lifetime parameter
  |
  = help: consider removing `'a`, referring to it in a field, or using a marker such as `PhantomData`

error[E0392]: lifetime parameter `'a` is never used
  --> crates/clorinde/src/queries/repro.rs:13:30
   |
13 | pub struct VectorRowBorrowed<'a> {
   |                              ^^ unused lifetime parameter
   |
   = help: consider removing `'a`, referring to it in a field, or using a marker such as `PhantomData`

Reproduction

clorinde.toml (tried with or without borrowed-type)

[types.mapping]
"public.vector" = { rust-type = "pgvector::Vector", borrowed-type = "pgvector::Vector", is-copy = false }

query

--! search_vectors : VectorRow()
SELECT id, embedding FROM vectors
ORDER BY embedding <=> :query_embedding
LIMIT :limit;

result struct file

// This file was generated with `clorinde`. Do not modify.

#[derive(Debug)]
pub struct SearchVectorsParams<'a> {
    pub query_embedding: pgvector::Vector,
    pub limit: i64,
}
#[derive(Debug, Clone, PartialEq, serde::Serialize, serde::Deserialize)]
pub struct VectorRow {
    pub id: uuid::Uuid,
    pub embedding: pgvector::Vector,
}
pub struct VectorRowBorrowed<'a> {
    pub id: uuid::Uuid,
    pub embedding: pgvector::Vector,
}
impl<'a> From<VectorRowBorrowed<'a>> for VectorRow {
    fn from(VectorRowBorrowed { id, embedding }: VectorRowBorrowed<'a>) -> Self {
        Self {
            id,
            embedding: embedding.into(),
        }
    }
}
// ... more stuff

Expected behavior

no angry compiler

Logs

Additional context

there is halcyonnouveau#186 that had similar for the return types

Severity

Annoyance