1	# W3C Trace Context Level 2 propagation, with its rules proved as laws. Source: https://github.com/LucasGois1/bend-trace-context
2	#
3	# Host entropy
4	# ============
5	#
6	# The first line is the package's description on BendHub, which describes a
7	# package by the first line of its first .bend file in path order: this one.
8	#
9	# The package's only host binding for randomness: entropy/native.c natively and
10	# entropy/webcrypto.js in JavaScript. generation.bend reads source words from
11	# it; trace_context.bend never does.
12	
13	import Base
14	
15	# One word from the host's cryptographic source: WebCrypto in JavaScript and
16	# the operating system's generator natively. Fail code 1 means unavailable and
17	# code 2 means source-failure in JavaScript; natively the code is the host
18	# errno with its strerror text. The pure codec never calls it implicitly.
19	def read_u32() -> IO(Result<&1, &1, U32 & String, U32>):
20	  import "./entropy/native.c"
21	  import "./entropy/webcrypto.js"