This commit introduces `StaticType::Variadic` to represent variadic
parameter types in function signatures. This allows for more precise
type checking of functions that accept a variable number of arguments,
such as arithmetic operators.
Previously, variadic functions were handled using `StaticType::Any`,
which was too permissive and could lead to runtime errors. The new
`Variadic` type enforces that all arguments must conform to a specified
inner type.
Changes include:
- Adding `StaticType::Variadic` to `src/ast/types.rs`.
- Updating the type checker to handle `Variadic` types correctly when
unifying with tuples or single arguments.
- Modifying built-in functions like arithmetic operators to use
`Variadic` for their parameter types.
- Improving error messages for function call mismatches to be more
specific.
- Adding a new test case to ensure arithmetic type mismatches are caught
at compile time.
- A new example `data_stream_pipe_buffered.myc` is added.
- The `HMA.myc` example now has a `Skip: output` directive.
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