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0.4.10

V 0.4.10

20 Mar 2025

Improvements in the language

• Implement assignable anonymous struct (fix #23855) (#23857)
• Remove ancient deprecations (#23479)

Breaking changes

• Make old [attr] syntax an error (@[attr] has to be used instead)
• builtin: string.index_after() now returns an Option (like string.index()), use string.index_after_() for the old behavior
• Vweb is now deprecated in favor of faster and more stable and easy to use veb

Checker improvements/fixes

• Allow none to be passed to ?T param (fix #23381) (#23385)
• Fix for iterator method .next(), not marked as used (fix #23312) (#23321)
• Fix generic var inferring to be passed to []T (fix #23315) (#23322)
• Clean up and optimise infix - reduce as casting (#23327)
• Fix structinit validation on nested generic Map[K]V (fix #23329) (#23332)
• Fix comptime indexexpr resolving (#23333)
• Fix comptime evaluation on infix expr (fix #23341) (#23344)
• Fix alias to fixed array w/ size defined by constant (fix #23356) (#23357)
• Fix missing option variable checking when casting using as operator (fix #23349) (#23358)
• Fix assign expected type on rechecking enum assigns (fix #23366) (#23367)
• Allow calling foo(?i64(123)) for fn foo(x ?I64) { and type I64 = i64 (#23373)
• Cache node.args[0] on fixed_array_builtin_method_call and array_builtin_method_call (#23411)
• Fix missing check for invalid prefixexpr expression &(&var) (fix #23365) (#23418)
• Disallow &((&a)) and similar expressions, with innermost ast.PrefixExpr (enhance #23418) (#23419)
• Fix call with mut arg with different pointer levels (fix #23157) (#23428)
• Fix missing detection for return in lockexpr stmts (fix #23434) (#23435)
• Do not allow auto reference of voidptr params
• Check if unwrapped m[key] if m is Option (fix #23446) (#23459)
• Builtin,checker: remove @[markused] from fn isnil(), set c.table.used_features.auto_str_ptr = true instead (#23464)
• Fix checker generic alias type (fix #23474) (#23475)
• Fix missing check for a := [none] (fix #23457) (#23504)
• Fix missing check for concrete type on match branch expr (fix #23506) (#23508)
• Fix missing check for invalid argument for builtin (fix #23511) (#23515)
• Fix selector nested unwrapping (fix #23519) (#23521)
• Fix message with old attr syntax (#23529)
• Cache repeated node.args.len, method.generic_names.len, node.concrete_types.len and node.op.str() (#23536)
• Disallow expr is Type if expr is Optional (fix #23486) (#23510)
• Make option_var.str() an error, when done without unwrapping it first (fix #23557, fix #23558) (#23563)
• Fix private symbol visibility checking (fix #23518) (#23543)
• Disallow constant modification on unsafe {} (#23588)
• Fix sumtype variant option type mismatch (#23659)
• Disallow arr = voidptr(0) (fix #23675) (#23687)
• Allow for module no_main programs, that can redefine their own main function, or not define any of their own as well
• Fix match branch checking of nonreturn call on last expr (fix #23698) (#23699)
• Check and error for invalid utf8 string literals (#23721)
• Fix call from unknown enum (fix #23728) (#23730)
• Add checker for passing multi return as arg to func that expects less param (fix #23735) (#23744)
• Fix spreed operator ref field validation (fix #23759) (#23760)
• Fix missing check for method that returns veb.Result (fix #23647) (#23762)
• Allow generic operators to be called in fn (fix #23773) (#23774)
• Fix missing struct cast validation (fix #23748) (#23788)
• Fix map when casting to interface (fix #23790) (#23799)
• Allow for pub type C.HINSTANCE = voidptr, being used in @[export: "wWinMain"] fn mymain(x C.HINSTANCE, xprev C.HINSTANCE, lpcmdline &C.WCHAR, cmdshow int) int { in module no_main programs (#23812)
• Add option type inference on if expr (implement most of #23827, except the error for v := if c { none } else { none }) (#23829)
• Add missing check for IfExpr and MatchExpr with no valid type (#23832)
• Fix MatchExpr type inferring, when none is used (fix #23831) (#23833)
• Add missing check for generic fntype type names (fix #23453) (#23850)
• Add checking for comptime assign without comptime if checking (fix #23796) (#23848)
• Fix option ptr field assign checking (fix #23879) (#23880)
• Add missing any type validation on assignment (fix #23905) (#23906)
• Add fntype casting validations (#23872)
• Fix signed integer literal overflow error, when most significant bit occupies signed bit (fix #23782) (#23919)
• Add missing check for casting generic type to literal values (#23915)
• Check if next() method infers generic type correctly (fix #23927) (#23932)
• Disallow references to constants (fix #23935) (#23942)
• Fix typeof evaluation for generic reference (fix #23951) (fix #23952) (#23958)

Parser improvements

• Reduce allocations in empty_comptime_const_expr (#23324)
• Add error for array init of Results []!type{} (fix #23360) (#23375)
• Allow map cast syntax map[k]v(expr) (#23401)
• Inline some commonly used fns (#23535)
• Fix anon fn return type option/result followed by comment parsing in vfmt mode (fix #23607) (#23608)
• Keep track of the number of all scanned tokens too, and show it with -stats
• Fix the error message position, for a struct Abc, that lacks a body (#23627)
• Prevent unused warning on import mod { Sym }, when Sym is later used, for more cases (fix #23412) (#23626)
• Add support for -d trace_parse_file_path_and_mod, to help diagnosing module lookup problems
• Allow for @[has_globals] to be used for all V programs, turn the @[wasm_import_namespace] error into a notice
• Remove table dep for script main check
• Fix enum value parsing inside array initialization (fix #23937) (#23941)
• Fix the registration of fixed arrays, when size_expr is a const (fix #23946) (#23949)
• Disallow invalid expr in comptime $for (fix #23953) (#23959)

Compiler internals

• markused: fix -skip-unused on a short program, that prints array (fix #23436) (#23437)
• markused: fix eprintln(err) on imported module on short program (related: #23498) (#23499)
• markused: fix markused auto str detection (fix #23501) (#23503)
• markused: fix option ptr printing (fix #23559) (#23562)
• checker,markused: add identification for sumtype.type_name() call (fix #23732) (#23739)
• markused: improve stability (avoid runtime crash) when processing generic functions (partial fix for #23927)
• markused: fix markused behavior on array / map index getter / setter / slice (#23931)
• markused: fix markused behavior on struct field's default expression (fix #23909) (#23933)
• builder: do not search for msvc when it is not needed (#23386)
• pref: stop parsing CLI options, on encountering -- (#23470)
• util: show unknown command suggestions, for more misspelled variants, like v sefl; make util.new_suggestion calls parametrizable
• pref: add Preferences.vroot_file/1 (done here, without using it, to ease the bootstrapping of the cheaders extraction, that will follow next)
• pref: fix panic in parse_args_and_show_errors, called with no args (fix #23713) (#23794)
• pref: allow for -os wasm32_emscripten and filtering _d_wasm32_emscripten.c.v and _notd_wasm32_emscripten.c.v files. (#23797)
• v.builder: show the last line of the C compiler output, in case of errors, in addition to the truncated first lines (the last line is useful, since it usually has an error counter)
• os,v.transformer: fix warnings for ./v -os cross -o vc/v.c cmd/v && clang-18 -o v_from_vc vc/v.c -lpthread
• util: fix stack overflow during parsing of #flag -DName=$d(...) (#23895)
• builder: extract Builder.show_parsed_files/0 to make it easier to debug import/parsing issues
• builder: remove forgotten b.show_parsed_files/0 call
• util.version: centralise the use of @VCURRENTHASH, to minimise the vlang/vc diffs for each commit
• builder: support -d trace_parsed_files
• util: shorten the V paths used in the C #line directives with tcc (the ../../../.. etc is no longer needed with newer tcc) (#23974)

Standard library

• json: fix default struct field initialization with long array (#23355)
• markused,builtin,strconv,vlib: reduce generated C sizes for compilers != tcc, for short programs, by simplifying the generation of backtraces, and reducing string interpolations in panics (#23380)
• thirdparty/sokol: allow -cflags -D_SGL_DEFAULT_MAX_VERTICES=4194304 to customize how many vertices you can send through gg/sokol in a frame
• crypto.ecdsa: expand ecdsa module, to support other curves like secp384r1, secp521r1, secp256k1 (#23407)
• crypto.ecdsa: fix memleaks, reported by the CI sanitizer jobs (#23450)
• ci: force the checking of changed vlib/crypto/ecdsa files with the sanitizer jobs
• builtin: add a @[markused] tag to isnil(), because cgen generates calls to it in some cases (#23462)
• builtin: reduce a bit the generated #if defined checks for small programs (#23484)
• crypto.ecdsa: improve safety checking, unify signing (and verifying) api to accept options (#23463)
• regex: fix misspelled word "firts" in replace_n description (#23514)
• os: add split_path/1: os.split_path('/usr/lib/test.so') -> ('/usr/lib','test','.so'); fix platform dependent behaviour of os.dir/1, os.base/1, os.file_name/1 (#23532)
• breaking,log: set stderr as default log output, add .set_output_stream() to allow for opting in the old default of stdout (#23444)
• builtin: add -prealloc -d prealloc_memset -d prealloc_memset_value=65 -d prealloc_dump, to better analyze the memory patterns of running V programs
• builtin: change the default builder size used for string interpolations, from 256 bytes to 64 bytes
• gg: mark create_image_with_size as deprecated (image resizing is done by stbi.resize_uint8/3, with a different fn signature) (#23580)
• crypto.ecdsa: split out the C w...

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