Module tracing::stdlib

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Re-exports either the Rust std library or core and alloc when std is disabled.

crate::stdlib::... should be used rather than std:: when adding code that will be available with the standard library disabled.

Note that this module is called stdlib rather than std, as Rust 1.34.0 does not permit redefining the name stdlib (although this works on the latest stable Rust).


Unstable module containing the unstable assert_matches macro.
Composable asynchronous iteration.
Compiler intrinsics.
Portable SIMD module.
Memory allocation APIs.
Utilities for dynamic typing or type reflection.
SIMD and vendor intrinsics module.
Utilities for the array primitive type.
Operations on ASCII strings and characters.
Support for capturing a stack backtrace of an OS thread
A module for working with borrowed data.
The Box<T> type for heap allocation.
Shareable mutable containers.
Utilities for the char primitive type.
The Clone trait for types that cannot be ‘implicitly copied’.
Utilities for comparing and ordering values.
Collection types.
Traits for conversions between types.
The Default trait for types with a default value.
Inspection and manipulation of the process’s environment.
Interfaces for working with Errors.
Constants for the f32 single-precision floating point type.
Constants for the f64 double-precision floating point type.
Utilities related to FFI bindings.
Utilities for formatting and printing Strings.
Filesystem manipulation operations.
Asynchronous basic functionality.
Generic hashing support.
Hints to compiler that affects how code should be emitted or optimized. Hints may be compile time or runtime.
i8Deprecation planned
Constants for the 8-bit signed integer type.
i16Deprecation planned
Constants for the 16-bit signed integer type.
i32Deprecation planned
Constants for the 32-bit signed integer type.
i64Deprecation planned
Constants for the 64-bit signed integer type.
i128Deprecation planned
Constants for the 128-bit signed integer type.
Traits, helpers, and type definitions for core I/O functionality.
isizeDeprecation planned
Constants for the pointer-sized signed integer type.
Composable external iteration.
Primitive traits and types representing basic properties of types.
Basic functions for dealing with memory.
Networking primitives for TCP/UDP communication.
Additional functionality for numerics.
Overloadable operators.
Optional values.
OS-specific functionality.
Panic support in the standard library.
Cross-platform path manipulation.
Types that pin data to its location in memory.
The Rust Prelude
This module reexports the primitive types to allow usage that is not possibly shadowed by other declared types.
A module for working with processes.
Manually manage memory through raw pointers.
Single-threaded reference-counting pointers. ‘Rc’ stands for ‘Reference Counted’.
Error handling with the Result type.
Utilities for the slice primitive type.
Utilities for the str primitive type.
A UTF-8–encoded, growable string.
Useful synchronization primitives.
Types and Traits for working with asynchronous tasks.
Native threads.
Temporal quantification.
u8Deprecation planned
Constants for the 8-bit unsigned integer type.
u16Deprecation planned
Constants for the 16-bit unsigned integer type.
u32Deprecation planned
Constants for the 32-bit unsigned integer type.
u64Deprecation planned
Constants for the 64-bit unsigned integer type.
u128Deprecation planned
Constants for the 128-bit unsigned integer type.
usizeDeprecation planned
Constants for the pointer-sized unsigned integer type.
A contiguous growable array type with heap-allocated contents, written Vec<T>.


Concatenates literals into a byte slice.
Concatenates identifiers into one identifier.
Same as format_args, but can be used in some const contexts.
Same as format_args, but adds a newline in the end.
Prints passed tokens into the standard output.
Enables or disables tracing functionality used for debugging other macros.
Asserts that a boolean expression is true at runtime.
Asserts that two expressions are equal to each other (using PartialEq).
Asserts that two expressions are not equal to each other (using PartialEq).
Evaluates boolean combinations of configuration flags at compile-time.
Expands to the column number at which it was invoked.
Causes compilation to fail with the given error message when encountered.
Concatenates literals into a static string slice.
Prints and returns the value of a given expression for quick and dirty debugging.
Asserts that a boolean expression is true at runtime.
Asserts that two expressions are equal to each other.
Asserts that two expressions are not equal to each other.
Inspects an environment variable at compile time.
Prints to the standard error.
Prints to the standard error, with a newline.
Expands to the file name in which it was invoked.
Creates a String using interpolation of runtime expressions.
Constructs parameters for the other string-formatting macros.
Parses a file as an expression or an item according to the context.
Includes a file as a reference to a byte array.
Includes a UTF-8 encoded file as a string.
A macro to test at runtime whether a CPU feature is available on x86/x86-64 platforms.
Expands to the line number on which it was invoked.
Returns whether the given expression matches any of the given patterns.
Expands to a string that represents the current module path.
Optionally inspects an environment variable at compile time.
Panics the current thread.
Prints to the standard output.
Prints to the standard output, with a newline.
Stringifies its arguments.
Declare a new thread local storage key of type std::thread::LocalKey.
Indicates unfinished code.
Unwraps a result or propagates its error.
Indicates unimplemented code by panicking with a message of “not implemented”.
Indicates unreachable code.
Creates a Vec containing the arguments.
Writes formatted data into a buffer.
Write formatted data into a buffer, with a newline appended.