Name clash in generated Rust code (regression in 2.0.0)

[ryzhyk]

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The following worked fine in 0.12:

union stage {LS_IN_PRE_LB, LS_OUT_PRE_LB}
table __Table_stage {
    v: stage;
}

table Flow {
    stage: stage; // NOTE: field name shadows union name, which is valid `.fbs` syntax
}

but in 2.0.0, I get the following error:

error[E0530]: function parameters cannot shadow tuple structs
    --> src/flatbuf_generated.rs:3658:31
     |
42   | pub struct stage(pub u8);
     | ------------------------- the tuple struct `stage` is defined here
...
3658 |   pub fn add_stage(&mut self, stage: flatbuffers::WIPOffset<flatbuffers::UnionWIPOffset>) {
     |                               ^^^^^ cannot be named the same as a tuple struct

Looking into it, union stage used to compile into a Rust enum in 0.12, but in 2.0 it is a tuple struct, which is not allowed to name-clash with a function argument.

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