Make printin the backtrace more convenient

Cargo.lock

@@ -1197,7 +1197,6 @@ name = "profile"
 version = "0.0.0"
 dependencies = [
  "arena",
- "backtrace",
  "cfg-if 1.0.0",
  "libc",
  "once_cell",
@@ -1566,6 +1565,9 @@ dependencies = [
 [[package]]
 name = "stdx"
 version = "0.0.0"
+dependencies = [
+ "backtrace",
+]
 
 [[package]]
 name = "syn"

crates/profile/Cargo.toml

@@ -13,7 +13,6 @@ doctest = false
 once_cell = "1.3.1"
 cfg-if = "1"
 libc = "0.2.73"
-backtrace = { version = "0.3.44", optional = true }
 
 arena = { path = "../arena", version = "0.0.0" }
 
@@ -24,5 +23,4 @@ perf-event = "0.4"
 cpu_profiler = []
 
 # Uncomment to enable for the whole crate graph
-# default = [ "backtrace" ]
 # default = [ "cpu_profiler" ]

crates/profile/src/lib.rs

@@ -15,21 +15,6 @@ pub use crate::{
     stop_watch::{StopWatch, StopWatchSpan},
 };
 
-/// Prints backtrace to stderr, useful for debugging.
-#[cfg(feature = "backtrace")]
-pub fn print_backtrace() {
-    let bt = backtrace::Backtrace::new();
-    eprintln!("{:?}", bt);
-}
-#[cfg(not(feature = "backtrace"))]
-pub fn print_backtrace() {
-    eprintln!(
-        r#"enable the backtrace feature:
-    profile = {{ path = "../profile", features = [ "backtrace"] }}
-"#
-    );
-}
-
 thread_local!(static IN_SCOPE: RefCell<bool> = RefCell::new(false));
 
 /// Allows to check if the current code is withing some dynamic scope, can be

crates/stdx/Cargo.toml

@@ -10,4 +10,9 @@ edition = "2018"
 doctest = false
 
 [dependencies]
+backtrace = { version = "0.3.44", optional = true }
 # Think twice before adding anything here
+
+[features]
+# Uncomment to enable for the whole crate graph
+# default = [ "backtrace" ]

crates/stdx/src/lib.rs

@@ -25,6 +25,27 @@ pub fn timeit(label: &'static str) -> impl Drop {
     Guard { label, start: Instant::now() }
 }
 
+/// Prints backtrace to stderr, useful for debugging.
+#[cfg(feature = "backtrace")]
+pub fn print_backtrace() {
+    let bt = backtrace::Backtrace::new();
+    eprintln!("{:?}", bt);
+}
+#[cfg(not(feature = "backtrace"))]
+pub fn print_backtrace() {
+    eprintln!(
+        r#"Enable the backtrace feature.
+Uncomment `default = [ "backtrace" ]` in `crates/stdx/Cargo.toml`.
+"#
+    );
+}
+
+pub fn to_lower_snake_case(s: &str) -> String {
+    to_snake_case(s, char::to_ascii_lowercase)
+}
+pub fn to_upper_snake_case(s: &str) -> String {
+    to_snake_case(s, char::to_ascii_uppercase)
+}
 fn to_snake_case<F: Fn(&char) -> char>(s: &str, change_case: F) -> String {
     let mut buf = String::with_capacity(s.len());
     let mut prev = false;
@@ -43,14 +64,6 @@ fn to_snake_case<F: Fn(&char) -> char>(s: &str, change_case: F) -> String {
     buf
 }
 
-pub fn to_lower_snake_case(s: &str) -> String {
-    to_snake_case(s, char::to_ascii_lowercase)
-}
-
-pub fn to_upper_snake_case(s: &str) -> String {
-    to_snake_case(s, char::to_ascii_uppercase)
-}
-
 pub fn replace(buf: &mut String, from: char, to: &str) {
     if !buf.contains(from) {
         return;