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Closes #1518. This PR implements the the proposed version that adds a syntax with a trailing comma in both type definitions and expressions.
Submission Checklist
Release notes
Length-1 tuples can now be declared using a trailing comma, e.g.
tuple(real, ) x = (3.14, );. This is primarily valuable for using tuples with the embedded laplace approximation feature, which uses tuples to pass arguments to user-defined callbacks.Copyright and Licensing
By submitting this pull request, the copyright holder is agreeing to
license the submitted work under the BSD 3-clause license (https://opensource.org/licenses/BSD-3-Clause)