V 0.4.2

30 September 2023

Improvements in the language

• Short lambda expressions like a.sorted(|x,y| x > y) (#19390)
• Support -os plan9, $if plan9 {, and _plan9.c.v (stage 1 for plan9) (#19389)
• fmt: simplify the processing logic for removing inline comments (#19297)
• Align the custom values of the enum fields (#19331)
• Do not warn/error for import flag as _
• Keep anon struct decl fields in interfaces (#19461)
• Support -N, turning all notices into errors, to ease the process of finding places that may need attention/correction

Breaking changes

• Remove inline comments (#19263)

Checker improvements/fixes

• Disallow module name duplicates in local names (#18118)
• Check enum fields with duplicate value (fix #19309) (#19310)
• Disallow alias ptr cast of a map value (#19336)
• Require else branch in [flag] enum match (#19375)
• Disallow assigning pointer values to option struct fields (#19380)
• Fix generic comparison for conditional assignment (#19401)
• Allow using ! and ~ on aliased bool and integral types (#19403)
• Warn -> error for uninitialized ref fields
• Parser, checker: allow lambdas anywhere anonymous functions are expected (#19436)
• Allow for each(a, |x| println(x)), i.e. using lambda expressions, when expecting fn (x int)
• Check fixed array init with default expression (#19472)
• Allow for const source = $embed_file(@FILE).to_string()
• Fix C.type in imported modules

Parser improvements

• parser: fix fixed array with eval const size (#19269)
• parser: disallow using sql as name (#19298)
• parser: fix ; support for module x;
• parser: fix fixed array of option values (_ := [10]?int{}) (#19392)
• parser: fix assigning with in another module sumtypes 2 (#19415)
• v.ast: improve Stmt.str(), showing more details about ast.Block, ast.DeferStmt, ast.ForInStmt, ast.GlobalDecl

Compiler internals

• pref: support -fast-math, passing either -ffast-math or /fp:fast (for msvc) to the C backend, and $if fast_math { to detect it at comptime
• parser, transformer: fix transformer.infix_expr() and cleanup parse_types.v (related #19269) (#19276)
• pref,builder: support -use-os-system-to-run to workaround segfaults using not fully updated xcode command line tools
• v.builder: fix compiling code, that imports modules from both src/modules and modules (#19437)
• os, v.builder: show more details, when a program ran by v run file.v, exits by a signal (fix #19412) (#19471)

Standard library

• math: speedup the pure V math.pow implementation for non-fractional powers (#19270)
• math: add more C. fn overrides, for the default C backend (speed up examples/path_tracing.v) (#19271)
• time: add MMM support for parse_format() (#19284)
• os: include sys/sysctl.h on FreeBSD to avoid implicit definition of sysctl function (#19293)
• crypto.md5: change the Digest.write return type, from ?int to !int (#19311)
• v.help: use os.executable() instead of @VEXE as an anchor, so v help will work more robustly.
• toml: fix custom to_toml for complex structs (#19338)
• all: support ; statements, allowing for oneliners like ./v -e 'import os; println( os.ls(os.args[1])!.sorted(a > b) )' vlib/math (#19345)
• vlib: add net.http.file, allowing for v -e "import net.http.file; file.serve()" (#19348)
• vlib: remove functions and fields, deprecated before 2023-03-20
• toml: fix toml encoding of complex types (#19408)
• arrays: add a partition function, that splits a given array, based on a criteria, passed as a callback fn (#19417)
• toml: add decoding for struct fields of type map[string]T (#19447)
• arrays: add arrays.each, arrays.each_indexed, and tests for them
• encoding.html: implement unescape() (#19267)

Web

• net.http: fix http.fetch(), without explicit method (default again to .get, not to .acl)
• net.http: default explicitly to Method.get for http.Request and http.FetchConfig too
• examples: add examples/fetch_ip.v, showing how to contact http://ifconfig.co/json and parse the result
• net.http: fix post error with https on windows (#19334)
• net.ssl: implement SSLConn.peer_addr() (#19333)

ORM

• orm: add references attribute to allow foreign key declarations on fields (#19349)
• orm: support different foreign key types, not just an integer id (#19337)
• orm: add support for V enum struct fields (#19374)
• orm: quote table and field name in [references] (#19387)

Database drivers

• db.pg: allow postgres connection using service definitions (#19288)

Native backend

• native: make native tests pass on windows; refactor PE file generation (#19140)
• native: parse dll files to resolve extern symbols (#19433)

C backend

• Fix printing struct with thread field (#19320)
• Fix the logic around the definition of VNORETURN and VUNREACHABLE (less warnings on FreeBSD) (#19316)
• Add support for -d trace_cgen_stmt, document it in CONTRIBUTING.md
• Fix printing smartcast interface variable (fix #18886) (#19372)
• Fix interface with multiple embedded fields (#19377)
• Fix channel of interface (fix #19382) (#19383)
• Fix fixed array of option type default (#19397)
• Fix interface with option field (#19434)
• Fix promoting an alias typed value, to a sumtype of the alias's base type (fix #19407) (#19423)
• Remove the special plan9 support code, treat it instead as a posix system in cheaders.v (#19445)
• Fix printing slice of fn call string (#19450)
• Fix type VType = &C.CType (#19452)
• Fix array of fns index call with direct_array_access mode (#19460)

Tools

• bench: a new bench/ directory for language benchmarks
• ci: test the pure V math versions without .c.v overrides on the CI too (#19292)
• github: add automatically info about voting to all new issues (#19351)
• tools: add -E flag to v test-parser, that will show the partial source that caused the parser to fail with -no-builtin -check-syntax file.v
• ci: bring back gitly
• github: improve the voting message for issues (#19448)
• vcreate: update templates, add lib (#19444)

Operating System support

• builtin: use libgc-threaded on FreeBSD, to get the threaded version of libgc (#19294)

Examples

• examples: add more .obj files for 06_obj_viewer (#19406)