v0.25

Changed

• Updated for new S-series kernel (version S31)

v0.25-rc1

Pre-release

v0.24

Changed

• Updated for Shen 22.4.

v0.23

Added

• Enabled programmable-pattern-matching extension.
• Non-string version of special scm. form.

Changed

• Updated for Shen 22.3.
• Updated Chez dependency to 9.5.4.
• if branches with a known test result are optimized away.
• Faster equality check against literal numbers.
• Faster globals.
• Various other optimizations.

v0.22

• Updated for Shen 22.1
• Replace factorisation implementation with extension from kernel.

v0.21

• Updated for Shen 22.0.
• Arguments to the shen-scheme binary have changed, and the launcher extension provided by the latest Shen kernel release is used, pass the --help argument to the executable to see the new format.
• Integrated new features extension provided by the latest Shen kernel release.

v0.20

• Added flag to allow disabling of pattern factorization.
• Improve pattern factorization by only hoisting labels that get jumped to from more than one place.
• Improve pattern factorization by generating fewer ifs in cases where the conditions can be merged into a single if + and.
• Compile chains of cons calls that result in a properly formed list into a single list call.
• Multiple aesthetic changes to the Scheme code the compiler generates.

v0.19

• Updated for Shen 21.2.
• Implemented pattern matching optimization. Speedup goes from modest in simple patterns to huge in patterns that deconstruct larger structures.
• Added missing *release* variable.
• Functions generated by compiling defun expressions are not wrapped in begin expressions anymore.

v0.18

• Updated for Shen 21.1.
• Updated Chez dependency from 9.5 to 9.5.2.
• Don't flush ports after calling write-byte unless the port is stdout or stderr.
• Override pr with a better performing implementation.
• Override vector constructor with better performing implementation.
• Override @p tuple constructor with better performing implementation.
• Make sysfunc? return true for scm. prefixed symbols.
• Add shen-scheme.find-library function that returns a path where libraries can be added.
• Remove "whoami" dependency.
• Fix compilation of let. Was not working correctly in where the variable name showed up on the right-side.
• Add support for Scheme's letrec through the scm.letrec form.
• Compile (thaw ...) expressions to direct function calls.
• Use path relative to shen-scheme executable as home.

v0.17

• Updated for Shen 21.
• Reduce overhead of trap-error in most situations.
• Return numbers when calling intern with numeric strings.
• Optimise calls to (intern "StringConstant").
• Add support for (scm. "(literal scheme code)") forms.
• Add --eval <expression> command-line option.
• Fix dicts not working properly with some key value types.
• Fix symbol? override so that it behaves like the Shen Kernel version.