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Set of rules defining correctly structured programs for the Rust programming language
The syntax of Rust is the set of rules defining how a Rust program is written and compiled. Rust's syntax is similar to that of C and C++, although many
Rust_syntax
General-purpose programming language
keyword, various specialized pointer types, and syntax support for channels. According to Steve Klabnik, Rust was influenced during this period by developers
Rust_(programming_language)
Set of rules defining correctly structured C++ program
influenced the syntax of several later languages including but not limited to Java, C#, and Rust. Much of C++'s syntax aligns with C syntax, as C++ provides
C++_syntax
Programming language feature
2023). "Unified function call syntax (UFCS)" (PDF). "Rename UFCS to accurately reflect its functionality. · Issue #1140 · rust-lang/rfcs". GitHub. Retrieved
Uniform_function_call_syntax
Form of text that defines C code
language extension) C data types C standard library C++ syntax C# syntax Java syntax Rust syntax List of C-family programming languages Operators in C and
C_syntax
Metadata which defines a property
by attaching metadata to a symbol. In Rust, attributes are a type of procedural macro, which acts on Rust syntax by consuming and producing code. Many
Attribute_(programming)
Project for adding Rust language to Linux kernel
set and syntax. An example Linux external loadable kernel module created using the Rust language was published by Taesoo Kim in 2013. The Rust for Linux
Rust_for_Linux
Macros whose expansion is guaranteed not to cause the capture of identifiers
identifiers. They are a feature of programming languages such as Scheme, Dylan, Rust, Nim, and Julia. The general problem of accidental capture was well known
Hygienic_macro
Configuration file format
being minimal (unlike the more-complex YAML) and by using human-readable syntax. The project standardizes the implementation of the ubiquitous INI file
TOML
compares the syntax of many notable programming languages. Programming language expressions can be broadly classified into four syntax structures: prefix
Comparison of programming languages (syntax)
Comparison_of_programming_languages_(syntax)
General-purpose programming language
expression matching. Additional debugging and syntax features are also included in this release, which include syntax suggestion, as well as error highlighting
Ruby_(programming_language)
List of programming languages types and the languages that meet its description
Rust Team (25 May 2026). "Module any". docs.rust-lang.org. The Rust Team. The Rust Team (25 May 2026). "Module field". docs.rust-lang.org. The Rust Team
List of programming languages by type
List_of_programming_languages_by_type
Conditional operator in computer programming
expression-oriented programming language, all Rust conditionals are expressions, not statements, so the if expr1 else expr2 syntax behaves like the C-style ?: ternary
Ternary_conditional_operator
Proprietary language for AI accelerators
Python, with the performance of a system programming language such as C++, Rust, and Zig. As of October 2025[update], the Mojo compiler is closed source
Mojo_(programming_language)
Rust software and development tools
and rust-mode Kate — basic Rust support via syntax highlighting and plugins Neovim / Vim — Rust support through plugins like rust.vim and coc-rust-analyzer
List of Rust software and tools
List_of_Rust_software_and_tools
Software library for data analysis
OLAP query engine implemented in Rust using Apache Arrow Columnar Format as the memory model. Although built using Rust, there are Python, Node.js, R, and
Polars_(software)
Lightweight programming language
based on the developer activity. Starlark syntax is a strict subset of Python syntax. Similar to Python syntax, Starlark relies on indentation to delimit
Starlark
Programming language
is statically typed and compiled. It is known for the simplicity of its syntax and the efficiency of development that it enables through the inclusion
Go_(programming_language)
Setting or re-setting the value associated with a variable name
such as C# and Rust, shown here, require explicit tuple construction and deconstruction with parentheses: // Valid C# or Rust syntax (a, b) = (b, a);
Assignment_(computer_science)
Patterns used in computer programming
alongside the original AT&T UNIX itself and had a formative influence on the syntax of UNIX command line utilities and therefore also on the present-day reimplementations
Glob_(programming)
General-purpose programming language
Zig attempts to use existing concepts and syntax wherever possible, avoiding the addition of different syntax for similar concepts. Further, its goal is
Zig_(programming_language)
Lightweight programming language
incorporated the data-description syntax of SOL (hence the name Lua: Sol meaning "Sun" in Portuguese, and Lua meaning "Moon"). Lua syntax for control structures
Lua
Data type that allows for values that are one of multiple different data types
2023-04-25. "Type layout - The Rust Reference". doc.rust-lang.org. Retrieved 2023-04-25. "Unions - The Rust Reference". doc.rust-lang.org. Retrieved 2023-04-25
Union_type
Programming language syntax designed for ease of use
In computer science, syntactic sugar is syntax within a programming language that is designed to make things easier to read or to express. It makes the
Syntactic_sugar
Apple's general-purpose, open-source, compiled programming language
the language. Structured concurrency uses Async/await syntax similar to Kotlin, JavaScript, and Rust. An async function is defined with the async keyword
Swift_(programming_language)
Function called at the end of an object's lifetime
example, a class X with a constructor X() has a destructor ~X()). C#: same syntax as C++ (~X()). Historically called destructors, now called finalizers due
Destructor (computer programming)
Destructor_(computer_programming)
High-level programming language
JavaScript APIs for I/O. Although Java and JavaScript are similar in name and syntax, the two languages are distinct and differ greatly in design. The first
JavaScript
Macro taking a varying number of arguments
variadic macros with no arguments was added in C++20 and C23. The declaration syntax is similar to that of variadic functions: a sequence of three full stops
Variadic_macro
language syntax and not an extension such as a library (libraries such as the posix-thread library implement a parallel execution model but lack the syntax and
List of concurrent and parallel programming languages
List_of_concurrent_and_parallel_programming_languages
Syntax extension and toolchain for OCaml
that is part of the OCaml programming language ecosystem. Reason uses many syntax elements from JavaScript, compiles to native code using OCaml's compiler
Reason_(programming_language)
Web standard and API
more traditional design, similar to other shading languages. The syntax is similar to Rust. Tint is a Google-made compiler for WGSL. Naga is a similar project
WebGPU
User-friendly interactive Unix shell
The creator of fish preferred to add new features as commands rather than syntax. This made features more discoverable, as the built-in features allow searching
Fish_(Unix_shell)
Functional programming construct
Java, ML, Python, Racket, Ruby, Rust, Scala, Swift and the symbolic mathematics language Mathematica have special syntax for expressing tree patterns and
Pattern_matching
General-purpose programming language
changed syntax. Python 2.7.18, released in 2020, was the last release of Python 2. Several releases in the Python 3.x series have added new syntax to the
Python_(programming_language)
Symbol representing the word "and" (&)
connective AND. This usage was adopted in computing. Many languages with syntax derived from C, including C++, Perl,, Python, and more differentiate between:
Ampersand
Traditional first example of a computer programming language
programming languages, this program is used to illustrate a language's basic syntax. Such a program is often the first written by a student of a new programming
Hello,_world
computer). Like natural languages, programming languages follow rules for syntax and semantics. There are thousands of programming languages and new ones
Comparison of programming languages
Comparison_of_programming_languages
Rule for substituting a set input with a set output
input and output may be a sequence of lexical tokens or characters, or a syntax tree. Character macros are supported in software applications to make it
Macro_(computer_science)
Function definition that is not bound to an identifier
is an expression that uses x {\displaystyle x} . Compare to the Python syntax of lambda x: M. The name "arrow function" refers to the mathematical "maps
Anonymous_function
General-purpose programming language
statements into blocks Executable code is contained in functions (no script-like syntax) Parameters are passed by value; pass by-reference is achieved by passing
C_(programming_language)
Computer science process
In these and similar languages, one may call a method for division with syntax that resembles dividend.divide(divisor) # dividend / divisor where the parameters
Dynamic_dispatch
GNU replacement for the Bourne shell
automation. The Bash command syntax is a superset of the Bourne shell's syntax, from which all basic features of the Bash syntax were copied. As a result
Bash_(Unix_shell)
General-purpose programming language
initializers. LINQ has two syntaxes: query syntax and method syntax. However, the compiler always converts the query syntax to method syntax at compile time. using
C Sharp (programming language)
C_Sharp_(programming_language)
Programming syntax
Method chaining is a common syntax for invoking multiple method calls in object-oriented programming languages. Each method returns an object, allowing
Method_chaining
Control flow statement that branches according to a Boolean expression
Lisp) support side-effects. Although the syntax of an if-then-else statement varies by language, the general syntax is shown as pseudocode below. The part
Conditional (computer programming)
Conditional_(computer_programming)
Basic programming language construct
possible to define as a user-defined function (e.g. sizeof in C) or has syntax different from that of a function (e.g. infix addition as in a+b). Like
Operator (computer programming)
Operator_(computer_programming)
Numerical computing environment and programming language
= 3*sin(x) y = -1.6097 3.0000 A simple array is defined using the colon syntax: initial:increment:terminator. For instance: >> array = 1:2:9 array = 1
MATLAB
Platform-agnostic component and application architecture
and officially supports development in C++ (via C++/WinRT, C++/CX or WRL), Rust/WinRT, Python/WinRT, JavaScript-TypeScript, and the managed code languages
Windows_Runtime
highly specialized, relying on mathematical notation and similarly obscure syntax. Throughout the 20th century, research in compiler theory led to the creation
History of programming languages
History_of_programming_languages
Feature of programming languages
"PEP 492 – Coroutines with async and await syntax". Matsakis, Niko. "Async-await on stable Rust!". Rust Blog. Retrieved 7 November 2019. Oppermann, Philipp
Async/await
Scripting language created in 1994
keywords and language syntax, PHP is similar to C-style syntax. if conditions, for and while loops and function returns are similar in syntax to languages such
PHP
dialect of C, having C-like syntax. The term curly bracket programming language denotes a language that shares C's block syntax. C-family languages have
List of C-family programming languages
List_of_C-family_programming_languages
Language for controlling a computer
languages are textual, this article discusses textual syntax. The programming language syntax is usually defined using a combination of regular expressions
Programming_language
Replacing placeholders in a string with values
ColdFusion Markup Language (CFML) script syntax: apples = 4; writeOutput("I have #apples# apples"); Tag syntax: <cfset apples = 4> <cfoutput>I have #apples#
String_interpolation
Typographical symbol (@)
"syntax – What does @@variable mean in Ruby?". Stack Overflow. Archived from the original on 2020-07-26. Retrieved 2020-05-05. "Patterns". The Rust Reference
At_sign
Tool to flag poor computer code
2002). "How to Use Lint for Static Code Analysis". Barr Group. rust-lang/rustfmt, The Rust Programming Language, 2025-01-20, retrieved 2025-01-21 Darwin
Lint_(software)
General-purpose programming language
the Java Class Library. However, type inference allows for more concise syntax. Kotlin mainly targets the JVM, but also compiles to JavaScript (e.g., for
Kotlin
Shading language for WebGPU
normative shader language for the WebGPU API on the web. WGSL's syntax is influenced by Rust and is designed with strong static validation, explicit resource
WebGPU_Shading_Language
Roles "The Rust macros guide". Rust. Retrieved 19 January 2015. "The Rust compiler plugins guide". Rust. Retrieved 19 January 2015. The Rust Reference
Comparison of multi-paradigm programming languages
Comparison_of_multi-paradigm_programming_languages
Markup language with simple, unobtrusive syntax
or humane markup language, is a markup language with simple, unobtrusive syntax. It is designed to be easy to write using any generic text editor and easy
Lightweight_markup_language
Programming language concept
between reference and value types for reasons such as runtime efficiency and syntax and semantic issues. In Java, a LinkedList<T> must be such that T is an
Boxing_(computer_programming)
Embedding assembly in a high-level language
GCC-style syntax on every architecture. MSVC only supports inline assembler on 32-bit x86. The Rust language has since migrated to a syntax abstracting
Inline_assembler
under Oberon) Swift (also under Ruby, Objective-C, and Haskell) Boo Cobra (syntax and features) ALGOL 68 ALGOL W Pascal Ada SPARK PL/SQL Turbo Pascal Object
Generational list of programming languages
Generational_list_of_programming_languages
Method for computer memory management
systems) use the syntax: __thread int number; Visual C++, Intel C/C++ (Windows systems), C++Builder, Clang, and Digital Mars C++ use the syntax: __declspec(thread)
Thread-local_storage
Container for a set of identifiers
third parties is a hierarchical namespace. A hierarchy is recursive if the syntax for the namespace names is the same for each subdelegation. An example of
Namespace
Integrated development environment from Microsoft
Linux, macOS and web browsers. Features include support for debugging, syntax highlighting, intelligent code completion, snippets, code refactoring, and
Visual_Studio_Code
Official compiler for the Rust programming language
The Rust compiler, usually invoked as rustc, is the official compiler for the Rust programming language. It is developed by the Rust Project and released
Rust_compiler
Syntactic construct for creating a list based on existing lists
based on the order of items in the input. In Haskell's list comprehension syntax, this set-builder construct would be written similarly, as: s = [ 2*x |
List_comprehension
Parser generator and library
incremental parsing library. It is used to parse source code into concrete syntax trees usable in compilers, interpreters, text editors, and static analyzers
Tree-sitter (parser generator)
Tree-sitter_(parser_generator)
Feature of some programming languages
representations of mathematical objects to be manipulated with the same syntax as on paper. Operator overloading does not change the expressive power of
Operator_overloading
Object-oriented programming language
had emerged, forming the basis for what is now termed Smalltalk-72. Its syntax and execution model were very different from modern Smalltalk variants.
Smalltalk
Structured method for writing natural language requirements
The Easy Approach to Requirements Syntax (EARS) is a structured method for writing natural language requirements using a small set of keywords and sentence
Easy Approach to Requirements Syntax
Easy_Approach_to_Requirements_Syntax
Programming language
Rust, Go, and Lisp". InfoWorld. Interview with Nim language creator Andreas Rumpf, 2020-03-09, retrieved 2023-10-15 "Nim Manual: Method call syntax"
Nim_(programming_language)
Typographic symbol (#)
S-expression syntax with short cuts and support for various data types (complex numbers, vectors and more). In Scheme, # is the prefix for certain syntax with
Number_sign
Text editor by Github
much of it was converted to JavaScript. Atom uses Tree-sitter to provide syntax highlighting for multiple programming languages and file formats. Like most
Atom_(text_editor)
Inherent flaw in computer instructions
BASIC and C are used to inform the design of later languages such as C# and Rust. A compiled language allows for detecting some typos (such as a misspelled
Software_bug
Object which stores memory addresses in a computer program
"Unsafe Rust". The Rust programming language (2nd ed.). No Starch Press. ISBN 978-1-7185-0310-6. OCLC 1363816350. "pointer - Rust". doc.rust-lang.org. Retrieved
Pointer (computer programming)
Pointer_(computer_programming)
Problem in computer programming
solved by making explicit the link between an else and its if, within the syntax. This usually helps avoid human errors. Possible solutions are: Having an
Dangling_else
languages rather than primarily English keywords. It supports localized syntax and multiple natural language keyword sets, making it accessible to learners
Non-English-based programming languages
Non-English-based_programming_languages
Time when a program is compiled
phases of a compiler. Most compilers have at least the following phases: syntax analysis, semantic analysis, and code generation. Many compilers include
Compile_time
Data type defined by combining other types
: [a] Cons is an abbreviation of construct. Many languages have special syntax for lists defined in this way. For example, Haskell and ML use [] for Nil
Algebraic_data_type
Feature of some compilers
compile-time function evaluation (CTFE) and code injection as an improved syntax for C++ template metaprogramming. In earlier versions of C++, template metaprogramming
Compile-time function execution
Compile-time_function_execution
Typographic character indicating a question (?)
ancestor class of (respectively) type T (including T itself). In the POSIX syntax for regular expressions, such as that used in Perl and Python, ? stands
Question_mark
T end: T Rust has a built-in range struct in the standard library in std::ops::Range. C++ has a std::ranges library as well since C++20. Rust has the
Range_(computer_programming)
Text editor
was first released in 2001. Intended for software developers, it features syntax highlighting, code folding, customizable layouts, multiple cursors and selections
Kate_(text_editor)
expression. (Until version 3.8 added 'assignment expressions', with a different syntax.) In some expression-oriented languages, expressions that merely cause side
Expression-oriented programming language
Expression-oriented_programming_language
Dialect of the Lisp programming language on the Java platform
programming language Lisp on the Java platform. Like most other Lisps, Clojure's syntax is built on S-expressions that are first parsed into data structures by
Clojure
Programming language
Apache Groovy is a Java-syntax-compatible object-oriented programming language for the Java platform. It is both a static and dynamic language with features
Apache_Groovy
Programming language and environment developed by Wolfram Research
developers access to the language's high-level functions. The Wolfram Language syntax is overall similar to the M-expression of 1960s LISP, with support for infix
Wolfram_Language
General-purpose, object-oriented programming language
within an Objective-C class. Objective-C derives its object syntax from Smalltalk. All of the syntax for non-object-oriented operations (including primitive
Objective-C
Lifetime of a computer software object
environment, objects are destroyed when the garbage collector chooses. The syntax for creation and destruction varies by programming context. In many contexts
Object_lifetime
Programming language
an object-oriented, class-based, garbage-collected language with C-style syntax. It can compile to machine code, JavaScript, or WebAssembly. It supports
Dart_(programming_language)
concatenated. This is called juxtaposition. Unix shells have a similar syntax. Rexx uses this syntax for concatenation including an intervening space. C (along with
Comparison of programming languages (strings)
Comparison_of_programming_languages_(strings)
Configuration file format
for computer software that consists of plain text with a structure and syntax comprising key–value pairs organized in sections. The name of these configuration
INI_file
General-purpose programming language
inspired by Go, and other programming languages including Oberon, Swift, and Rust. It is free and open-source software released under the MIT License, and
V_(programming_language)
Functional programming language
lexical syntax of operators and comments was addressed, and the interaction of do-notation and if-then-else was tweaked to eliminate unexpected syntax errors
Haskell
Programming language with hardware abstraction
adding concise syntax and null-safety features. Go was designed for simple syntax, fast compilation, and built-in concurrency support. Rust emphasized memory
High-level programming language
High-level_programming_language
Programming languages parsing of command-line arguments
of options varies widely between operating systems. In most cases, the syntax is by convention rather than an operating system requirement; the entire
Command-line_argument_parsing
Programming language
application software with interactive graphical user interfaces. Newsqueak's syntax and semantics are influenced by the C language, but its approach to concurrency
Newsqueak
Programming language construct
notably conditional expressions with varying syntax, such as the ternary conditional. The Elvis operator is syntax for a short-circuit AND which returns the
Short-circuit_evaluation
RUST SYNTAX
RUST SYNTAX
Surname or Lastname
English
English : variant of Rouse.German : variant of Reusse (see Reuss 1).Probably also an Americanized form of Czech Rus ‘Russian’.
Surname or Lastname
Swiss German
Swiss German : topographic name for someone who lived by a prominent elm tree, Rust (Old High German ruost), or in northern Germany for someone who lived by a resting place or halt along a route, from Middle Low German ruste ‘rest’.English (chiefly East Anglia) and Scottish : nickname for someone with red hair or a ruddy complexion, from Old English rūst ‘rust’ (from a Germanic root meaning ‘red’).
Surname or Lastname
English
English : from Old English dūst ‘dust’, applied as a nickname, possibly for someone with a dusty complexion or hair (as, for example, a miller), or for a worthless person.North German : possibly a Westphalian habitational name from a farm named with dost ‘bush’, ‘brush’. However, the word also means ‘fine dust’, ‘flour’ and may have been applied as an occupational nickname for a miller. Compare 1.
Surname or Lastname
English
English : topographic name for someone who lived among rushes, from Middle English rush (a collective singular, Old English rysc), or perhaps an occupational name for someone who wove mats, baskets, and other articles out of rushes.Irish : reduced Anglicized form of Gaelic Ó Ruis ‘descendant of Ros’, a personal name perhaps derived from ros ‘wood’. In Connacht it has also been used as a translation of Ó Luachra (see Loughrey).Irish : Anglicized form (translation) of Gaelic Ó Fuada, ‘descendant of Fuada’ a personal name meaning ‘hasty’, ‘rushing’ (see Foody).Altered spelling of German Rüsch or Rusch (see Rusch) or Rosch.Benjamin Rush (1745–1813), a physician and signer of the Declaration of Independence, was born in the PA farming community of Byberry. He was descended from John Rush, a yeoman from Oxfordshire, England, who came to Byberry in 1683.
Girl/Female
Dutch
Surname or Lastname
English
English : variant of Priest.German : variant of Brust.
Boy/Male
English American
Nickname for a red-haired person.
Surname or Lastname
English (Kent)
English (Kent) : from Middle English crust(e), Old French crouste ‘crust of bread’, according to Reaney applied as a nickname for a stubborn or obstinate person.
Male
Icelandic
Icelandic form of Latin Laurus, LÃRUS means "laurel."
Boy/Male
French
Red haired.
Boy/Male
English
Dusty Place; Diminutive of Dustin
Male
Iranian/Persian
(کوروش) Variant form of Persian Khorvash, KÛRUSH means "like the sun."Â
Male
English
Short form of English Russell, RUSS means "little red one."
Boy/Male
American, British, English, Latin
Just
Surname or Lastname
English (Devon)
English (Devon) : unexplained; perhaps a variant of Trist, from Middle English triste ‘hunting station’ (Old French triste), hence probably a metonymic occupational name for someone whose job was to look after the hounds or organize the hunt.Altered form of Trost.
Boy/Male
English American French
Form of Rufus: Red-haired.
Surname or Lastname
English
English : variant spelling of Rouse.German : from a short form of a Germanic personal name formed with hrÅd ‘renown’.German (of Slavic origin) : from Old Slavic rusu ‘reddish’, ‘blond’, hence a nickname or an ethnic name meaning ‘Russian’.Swiss German : topographic name for someone who lived by a scree, Middle High German ru(o)zze.In some instances the name referred to personal or business connections with Russia, the country of the Reussen, from Middle High German Riusse.
Surname or Lastname
English (Lincolnshire)
English (Lincolnshire) : unexplained. Black identified this as a Scottish name of Pictish origin. However, the modern distribution of the surname, almost exclusively in Lincolnshire and adjoining counties, suggests a more localized eastern English origin.
Surname or Lastname
English
English : variant of Root 1 and 2.German : variant of Ruth 2.German (Rütt) : topographic name of uncertain meaning (see Rutten 3).
Boy/Male
English
Dusty place; brave soldier.
RUST SYNTAX
RUST SYNTAX
Girl/Female
German, Teutonic
Warrior
Boy/Male
Indian, Sanskrit
The Hottest Month in the Indian Calender
Surname or Lastname
English (mainly central)
English (mainly central) : topographic name for someone who lived where holly trees grew, from Middle English holi(n)s, plural of holin, holi(e) (Old English hole(g)n).
Girl/Female
Teutonic
Glorified battle maiden.
Female
Spanish
Spanish feminine form of Latin Crescentius, CRESCENCIA means "to spring up, grow, thrive."
Girl/Female
Arabic, Muslim
Saved One
Biblical
the Lord is my father,father (i.e., "possessor or worshipper") of Jehovah
Boy/Male
Gujarati, Hindu, Indian
Light; Lamp
Surname or Lastname
English
English : patronymic from Spark 1.
Girl/Female
American, Australian
Darling
RUST SYNTAX
RUST SYNTAX
RUST SYNTAX
RUST SYNTAX
RUST SYNTAX
n.
Foul matter arising from degeneration; as, rust on salted meat.
v. t.
To sprinkle with dust.
n.
A moving forward with rapidity and force or eagerness; a violent motion or course; as, a rush of troops; a rush of winds; a rush of water.
superl.
Resembling, or covered with a substance resembling, rust; affected with rust; rubiginous.
n.
A composition used in making a rust joint. See Rust joint, below.
n.
A rusher; as, the center rush, whose place is in the center of the rush line; the end rush.
superl.
Rust-colored; dark.
v. t.
To free from dust; to brush, wipe, or sweep away dust from; as, to dust a table or a floor.
n.
A minute mold or fungus forming reddish or rusty spots on the leaves and stems of cereal and other grasses (Trichobasis Rubigo-vera), now usually believed to be a form or condition of the corn mildew (Puccinia graminis). As rust, it has solitary reddish spores; as corn mildew, the spores are double and blackish.
v. t.
To make a rut or ruts in; -- chiefly used as a past participle or a participial adj.; as, a rutted road.
n.
Gold dust
superl.
Covered or affected with rust; as, a rusty knife or sword; rusty wheat.
v. i.
To contract rust; to be or become oxidized.
n.
That which resembles rust in appearance or effects.
n.
To lean in confidence; to trust; to rely; to repose without anxiety; as, to rest on a man's promise.
a.
Held in trust; as, trust property; trustmoney.
a.
Full of rust; resembling rust; causing rust; rusty.
v. t.
To cause to contract rust; to corrode with rust; to affect with rust of any kind.
v. i.
To be affected with the parasitic fungus called rust; also, to acquire a rusty appearance, as plants.
n.
See Roust.