blog: release-0.17

Author: Chemaclass

content/blog/2025-06-01-release-0.17.md

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+title = "Release: v0.17.0"
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+
+## Macroverse
+
+### ✨ TL;DR
+
+This release supercharges the REPL with completions and precise error traces, introduces powerful new macros (`doto`, `time`, `if-let`, `when-let`), adds `macroexpand` support, enables native yield, improves string handling, and delivers broad performance gains and critical bug fixes.
+
+## Highlights
+
+### 🧠 Language Features
+
+- New macros: `doto`, `time`, `if-let`, `when-let`
+- `defexception` special form for custom exception types
+- Native `yield` support
+- Strings in output are now wrapped in quotes
+- Added `str\contains?` and `str\repeat` functions
+- New conversion functions: `phel->php` and `php->phel`
+
+### 🛠 Macro & Meta Programming
+
+- `macroexpand` functions for inspecting macros
+- Deprecated metadata is now visible in `doc` output
+- Macros now resolve correctly in namespaces with hyphens
+- Namespace encoding improved (hyphens converted to underscores)
+
+### 💻 REPL Improvements
+
+- REPL completion (auto-suggest)
+- REPL exceptions now show filename:line for better traceability
+- Namespace evaluation and re-definition fixes
+- Proper handling of global variables and re-definable bindings
+
+## Bug Fixes
+
+### 🧩 Core Language Fixes
+
+- Fixed `php/echo` not working
+- Fixed malfunctioning `hash-map`
+- Corrected behavior of multibyte string case functions
+- Resolved analyzer null checks and symbol resolution issues
+- Fixed private symbol resolution
+
+### 🧷 REPL Stability
+
+- Fixed global var handling
+- Allowed re-definitions in REPL
+- Fixed issues with `html` macro when used with when
+- Corrected bracket handling in multiline REPL strings
+- Fixed evaluation bugs in REPL namespaces
+- Fixed the inability to reload the user namespace
+
+### 🔐 Security
+
+- Patched header injection vulnerability
+
+## Performance & Internals
+
+- Optimized vector iteration and overall performance
+- Fixed test placeholders not being replaced in multiline strings
+- Clarified behavior of `all?` returning true for empty collections
+- Documented internals of the compiler
+- Fixed workflow cache usage in CI
+- Upgraded static analysis to PHPStan level 2
+
+## Full list
+
+For a full list of changes, have a look at
+the [release notes](https://github.com/phel-lang/phel-lang/releases/tag/v0.17.0).