Plumb the wasmtime-internal-error/backtrace cargo feature through to wasmtime (#12390)

Author: fitzgen

Cargo.toml

@@ -477,6 +477,7 @@ default = [
   "wasi-tls",
 
   # Most features of Wasmtime are enabled by default.
+  "backtrace",
   "wat",
   "parallel-compilation",
   "pooling-allocator",
@@ -540,6 +541,7 @@ wasi-http = ["component-model", "dep:wasmtime-wasi-http", "dep:tokio", "dep:hype
 wasi-config = ["dep:wasmtime-wasi-config"]
 wasi-keyvalue = ["dep:wasmtime-wasi-keyvalue"]
 pooling-allocator = ["wasmtime/pooling-allocator", "wasmtime-cli-flags/pooling-allocator"]
+backtrace = ["wasmtime/backtrace"]
 component-model = [
   "wasmtime/component-model",
   "wasmtime-wast?/component-model",

crates/environ/Cargo.toml

@@ -57,6 +57,7 @@ required-features = ['component-model', 'compile']
 
 [features]
 anyhow = ["wasmtime-error/anyhow"]
+backtrace = ["std", "wasmtime-error/backtrace"]
 component-model = [
   "dep:wasmtime-component-util",
   "dep:semver",
@@ -81,4 +82,5 @@ std = [
   'object/std',
   'wasmparser/std',
   'indexmap/std',
+  'wasmtime-error/std',
 ]

crates/wasmtime/Cargo.toml

@@ -133,6 +133,7 @@ harness = false
 [features]
 default = [
   'async',
+  'backtrace',
   'cache',
   'gc',
   'gc-drc',
@@ -159,6 +160,9 @@ default = [
 # Enables conversion helpers between `anyhow::Error` and `wasmtime::Error`.
 anyhow = ["wasmtime-environ/anyhow"]
 
+# Enables backtrace capturing in `wasmtime::Error`.
+backtrace = ["std", "wasmtime-environ/backtrace"]
+
 # An on-by-default feature enabling runtime compilation of WebAssembly modules
 # with the Cranelift compiler. Cranelift is the default compilation backend of
 # Wasmtime. If disabled then WebAssembly modules can only be created from