v2.33.0 (5 September 2023)

• Added tuple types to the language (#1100)
• The following deprecations have been turned into errors this version:
  • The old array syntax, e.g. int arr[5];. Use array[5] int arr; instead.
  • Distribution functions ending in _log. Use either _lpdf or _lpmf.
  • The functions binomial_coefficient_log, multiply_log, and cov_exp_quad. Use lchoose, lmultiply, and gp_exp_quad_cov respectively.
  • The if_else function. Use the ternary operator cond ? true_value : false_value
  • Use of CDFs with a , between the first and second argument. Use a |.
  • Comments beginning with #. Use //.
  • Use of <- for assignment. Use =.
  • The increment_log_prob function. Use the target += statement.
  • The get_lp() function. Use target().
  • The use of nested multi-indices on the left hand side of an assignment statement.
    For this version, these can all be automatically updated with the --canonicalize=deprecations argument to the autoformatter. This is not guaranteed to work for versions following this one.
    Additionally, the following identifiers are now reserved words: array, offset, multiplier, lower, and upper.
    (#1287)
• Exposed vectorized signatures for log_sum_exp (#1344)
• Exposed new functions qr, qr_thin, eigendecompose_sym, eigendecompose, complex_schur_decompose, svd, and csr_extract. (#1346)
• Added a log_prob_impl specialization specifically for reverse mode to improve code generation (#1327)
• Fixed an issue where returning array literals could produce the wrong types in C++. (#1335)
• Fixed an issue with leading zeroes in real literals like 0E0 (#1336)
• Fixed a bug with type promotion in the arguments to user-defined distributions generating bad C++. (#1338)
• Fixed optimization logic for deducing whether mixes of scalars, data matrices, and autodiff matrices can be promoted to SoA (#1347)
• Fixed an issue with the partial evaluator crashing on statements containing a mod-by-zero. (#1351)
• --filename-in-msg now also affects the name of the file shown in runtime exceptions. Useful for interfaces which use mangled or temporary names during compilation. (#1339)
• Improved error message provided when the wrong return type is returned from a function.
  Return statements now follow the same type promotion rules as assignment and function argument passing.
  The typechecker now allows infinite loops (while (1) without an internal break) to be the end of a returning function. Previously, an (unreachable) return statement was needed following the loop.
  (#1341)
• Improved error messages for unsupported type in reduce_sum (#1332)
• Improved error messages when using a reserved word as a variable name. (#1343)