string[] latlng= yourJsonString.split[','];或cargo run忽略任何代码更改。
假设我有一个程序
cargo rebuild然后我做fn main() {
println!("Hello, World!");
}
并看到：
cargo run然后我将代码更改为：
Compiling myproject v0.1.0 (/Volumes/.../myproject)
Finished dev [unoptimized + debuginfo] target(s) in 0.52s
Running `target/debug/myproject`
Hello, World!
fn main() {
println!("Hello, Worldaefafeff!");
print!("22222412414");
}
：
cargo run即使我看到“编译”行，这意味着 Compiling myproject v0.1.0 (/Volumes/.../myproject)
Finished dev [unoptimized + debuginfo] target(s) in 0.76s
Running `target/debug/myproject`
Hello, World!
知道文件已更改，其输出也相同。当我运行cargo时，也会发生同样的情况。我是否需要每次运行cargo build？任何建议表示赞赏，谢谢！
----- 更新
好的，我看到很多人说我做错了。我只在终端重复了所有步骤。有什么问题吗？
cargo clean所以您看到编译发生了，但是输出是相同的。第二次没有编译步骤。我显然不明白我做错了什么。
毫无疑问，倒数第二次发射实际上显示了“你好，世界”。我确实正确复制了终端内容
----- Update2
Genychs-iMac:~ defake$ z /Volumes/MainBrain/Programming/Projects/Personal
Genychs-iMac:Personal defake$ cargo new notworking
Created binary (application) `notworking` package
Genychs-iMac:Personal defake$ cd notworking/
Genychs-iMac:notworking defake$ cargo run
Compiling notworking v0.1.0 (/Volumes/MainBrain/Programming/Projects/Personal/notworking)
Finished dev [unoptimized + debuginfo] target(s) in 0.55s
Running `target/debug/notworking`
Hello, world!
Genychs-iMac:notworking defake$ printf 'fn main() {' > src/main.rs
Genychs-iMac:notworking defake$ printf '\n\tprintln!("Other text");' >> src/main.rs
Genychs-iMac:notworking defake$ printf '\n}\n' >> src/main.rs
Genychs-iMac:notworking defake$ cargo run
Compiling notworking v0.1.0 (/Volumes/MainBrain/Programming/Projects/Personal/notworking)
Finished dev [unoptimized + debuginfo] target(s) in 0.33s
Running `target/debug/notworking`
Hello, world!
Genychs-iMac:notworking defake$ cd src
Genychs-iMac:src defake$ cargo run
Finished dev [unoptimized + debuginfo] target(s) in 0.00s
Running `/Volumes/MainBrain/Programming/Projects/Personal/notworking/target/debug/notworking`
Hello, world!
Genychs-iMac:src defake$ cat main.rs
fn main() {
println!("Other text");
}
Genychs-iMac:src defake$ cargo run
Finished dev [unoptimized + debuginfo] target(s) in 0.00s
Running `/Volumes/MainBrain/Programming/Projects/Personal/notworking/target/debug/notworking`
Hello, worlGenychs-iMac:src defake$ cargo clean
Genychs-iMac:src defake$ cargo run
Compiling notworking v0.1.0 (/Volumes/MainBrain/Programming/Projects/Personal/notworking)
Finished dev [unoptimized + debuginfo] target(s) in 0.48s
Running `/Volumes/MainBrain/Programming/Projects/Personal/notworking/target/debug/notworking`
Other text
Genychs-iMac:src defake$
然后更新了代码
Genychs-iMac:secondtry defake$ cargo run
Compiling secondtry v0.1.0 (/Volumes/MainBrain/Programming/Projects/Personal/secondtry)
Finished dev [unoptimized + debuginfo] target(s) in 1.13s
Running `target/debug/secondtry`
Other text 15
Genychs-iMac:secondtry defake$ ls -l target/debug/
total 776
drwxr-xr-x 0 defake staff 0 Jul 20 18:03 build
drwxr-xr-x 0 defake staff 4096 Jul 20 18:03 deps
drwxr-xr-x 0 defake staff 0 Jul 20 18:03 examples
drwxr-xr-x 0 defake staff 0 Jul 20 18:03 incremental
drwxr-xr-x 0 defake staff 0 Jul 20 18:03 native
-rwxr-xr-x 2 defake staff 291112 Jul 20 18:03 secondtry
-rw-r--r-- 1 defake staff 159 Jul 20 18:03 secondtry.d
lrwxr-xr-x 1 defake staff 0 Jul 20 18:03 secondtry.dSYM -> deps/secondtry-d4f28f61785f1e66.dSYM
我注意到，如果我运行Genychs-iMac:secondtry defake$ cargo run
Compiling secondtry v0.1.0 (/Volumes/MainBrain/Programming/Projects/Personal/secondtry)
Finished dev [unoptimized + debuginfo] target(s) in 0.36s
Running `target/debug/secondtry`
Other text 15
Genychs-iMac:secondtry defake$ ls -l target/debug/
total 776
drwxr-xr-x 0 defake staff 0 Jul 20 18:03 build
drwxr-xr-x 0 defake staff 4096 Jul 20 18:04 deps
drwxr-xr-x 0 defake staff 0 Jul 20 18:03 examples
drwxr-xr-x 0 defake staff 0 Jul 20 18:03 incremental
drwxr-xr-x 0 defake staff 0 Jul 20 18:03 native
-rwxr-xr-x 2 defake staff 291112 Jul 20 18:04 secondtry
-rw-r--r-- 1 defake staff 159 Jul 20 18:04 secondtry.d
lrwxr-xr-x 1 defake staff 0 Jul 20 18:03 secondtry.dSYM -> deps/secondtry-d4f28f61785f1e66.dSYM
Genychs-iMac:secondtry defake$ strings target/debug/secondtry
Other text 15
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
stack backtrace:
<... and possibly more>RUST_BACKTRACE0full : -
<unknown>
at .: at
main
called `Option::unwrap()` on a `None` valuesrc/libcore/option.rscalled `Result::unwrap()` on an `Err` valuefailed to get environment variable ``: src/libstd/env.rs
src/libstd/sync/once.rsassertion failed: state & STATE_MASK == RUNNINGOnce instance has previously been poisoned
assertion failed: `(left == right)`
left: ``,
right: ``memory allocation of bytes failed
<unnamed>' panicked at '',
note: Run with `RUST_BACKTRACE=1` environment variable to display a backtrace.
thread panicked while processing panic. aborting.
thread panicked while panicking. aborting.
failed to initiate panic, error
src/libstd/sys/unix/os.rsstrerror_r failure
src/libstd/sys/unix/rwlock.rsrwlock maximum reader count exceededrwlock read lock would result in deadlock
Box<Any>thread '...
called `Option::unwrap()` on a `None` valuesrc/libcore/option.rsfailed to write the buffered data
stack overflowsrc/libstd/sys/unix/stack_overflow.rsfailed to allocate an alternative stack
called `Option::unwrap()` on a `None` valuesrc/libcore/option.rscalled `Result::unwrap()` on an `Err` valueuse of std::thread::current() is not possible after the thread's local data has been destroyedsrc/libstd/thread/mod.rsinconsistent park stateassertion failed: `(left == right)`
left: ``,
right: ``: park state changed unexpectedly
failed to generate unique thread ID: bitspace exhaustedthread name may not contain interior null bytesinconsistent state in unpark
data provided contains a nul byteunexpected end of fileother os erroroperation interruptedwrite zerotimed outinvalid datainvalid input parameteroperation would blockentity already existsbroken pipeaddress not availableaddress in usenot connectedconnection abortedconnection refusedpermission denied
(os error )
connection resetentity not found
already borrowed
: src/libcore/result.rs
cannot access stdout during shutdownfailed printing to src/libstd/io/stdio.rsstdout
failed to write whole bufferformatter errorsrc/libstd/sys_common/at_exit_imp.rsassertion failed: queue != DONE
src/libstd/sys/unix/mod.rsassertion failed: signal(libc::SIGPIPE, libc::SIG_IGN) != libc::SIG_ERR
src/libcore/slice/mod.rsassertion failed: `(left == right)`
left: ``,
right: ``: destination and source slices have different lengths
src/libstd/sync/condvar.rsattempted to use a condition variable with two mutexes
SomeNoneinternal error: entered unreachable codesrc/liballoc/raw_vec.rsTried to shrink to a larger capacity
/private/tmp/rust-20190704-90201-o56ua9/rustc-1.36.0-src/src/libcore/str/pattern.rs
attempt to calculate the remainder with a divisor of zero
src/liballoc/vec.rsassertion failed: end <= len
__rust_begin_short_backtracePoisonError { inner: .. }failed to allocate libbacktrace state
src/libstd/sys/unix/thread.rsassertion failed: PAGE_SIZE != 0
src/libstd/sys/unix/thread.rsfailed to allocate a guard pagefailed to protect the guard page
failed to write whole bufferformatter error
unexpected return value while unwinding:
src/libstd/sys/unix/backtrace/tracing/gcc_s.rs
UnwindError
NulErrorkind
/private/tmp/rust-20190704-90201-o56ua9/rustc-1.36.0-src/src/libcore/str/pattern.rsalready mutably borrowedcalled `Option::unwrap()` on a `None` valuesrc/libcore/option.rs
AccessError
cannot access a TLS value during or after it is destroyed
__rust_begin_short_backtrace
src/libstd/sys_common/thread_info.rsassertion failed: c.borrow().is_none()fatal runtime error:
thread '' has overflowed its stack
<unknown>StringErroralready borrowedcalled `Option::unwrap()` on a `None` valuesrc/libcore/option.rs
/private/tmp/rust-20190704-90201-o56ua9/rustc-1.36.0-src/src/libcore/str/pattern.rscalled `Option::unwrap()` on a `None` valuesrc/libcore/option.rscalled `Result::unwrap()` on an `Err` value.llvm.
E._ZNZN::_$.@*&<>()$C$,$u7e$~$u20$ $u27$'$u3d$=$u5b$[$u5d$]$u7b${$u7d$}$u3b$;$u2b$+$u22$"
__ZN$SP$$BP$$RF$$LT$$GT$$LP$$RP$
: src/libcore/result.rs_URC_FAILURE_URC_CONTINUE_UNWIND_URC_INSTALL_CONTEXT_URC_HANDLER_FOUND_URC_END_OF_STACK_URC_FATAL_PHASE1_ERROR_URC_FATAL_PHASE2_ERROR_URC_FOREIGN_EXCEPTION_CAUGHT_URC_NO_REASON
_URC_NORMAL_STOPsrc/liballoc/raw_vec.rscapacity overflow0x00010203040506070809101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899
src/libcore/option.rs
, { } }(
5556
:index out of bounds: the len is but the index is called `Option::unwrap()` on a `None` valuesrc/libcore/option.rs
./?\]_
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<dS
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ParseIntErrorUnderflowInvalidDigitEmpty
ZeroOverflow
) when slicing `
BorrowError
BorrowMutErrorcalled `Option::unwrap()` on a `None` valuesrc/libcore/option.rs
src/libcore/slice/mod.rsindex out of range for slice of length slice index starts at but ends at attempted to index slice up to maximum usize
src/libcore/str/mod.rs[...]byte index is out of bounds of ``begin <= end ( is not a char boundary; it is inside ) of `
Utf8Errorvalid_up_toerror_len <= (bytes called `Option::unwrap()` on a `None` valuesrc/libcore/option.rssrc/libcore/fmt/mod.rs
src/libcore/str/pattern.rs
src/libcore/unicode/bool_trie.rs
malloc
realloc
.debug_info
unrecognized DWARF version
DWARF underflow
%s in %s at %d
abbrev offset out of range
.debug_abbrev
LEB128 overflows uint64_t
invalid abbreviation code
DW_FORM_strp out of range
unrecognized DWARF form
unrecognized address size
signed LEB128 overflows uint64_t
ranges offset out of range
.debug_ranges
unit line offset out of range
.debug_line
unsupported line number version
invalid directory index in line number program header
invalid directory index in line number program
invalid file number in line number program
invalid file number in DW_AT_call_file attribute
abstract origin or specification out of range
invalid abstract origin or specification
function ranges offset out of range
failed to read executable information
/proc/self/exe
/proc/curproc/file
/proc/%ld/object/a.out
libbacktrace could not find executable to open
close
lseek
read
file too short
backtrace library does not support threads
executable file contains out of range command offset
executable file is missing an identifying UUID
__TEXT
executable is missing __TEXT segment
dSYM file contains out of range string table index
dSYM file contains unterminated string
dSYM file is missing an identifying uuid
dSYM file contains out of range command offset
__DWARF
/Contents/Resources/DWARF
could not open DWARF directory in dSYM
executable file is not loaded
could not open directory containing executable
.dSYM
__debug_info
__debug_line
__debug_abbrev
__debug_ranges
__debug_str
no debug info in Mach-O executable
no symbol table in Mach-O executable
"#$%&
,-./0
>?@ABCDEF
，则输出已过时。但是，如果我运行target/debug/secondtry，则会得到正确的输出。