Update faerie, remove usage of failure (#591)

This commit removes the usage of the `failure` crate and finishes up the
final pieces of the migration to `std::error::Error` and `anyhow`. The
`faerie` crate was updated to pull in its migration from `failure` to
`anyhow` as well.

crates/debug/src/lib.rs

@@ -4,9 +4,9 @@
 
 use alloc::string::String;
 use alloc::vec::Vec;
+use anyhow::Error;
 use cranelift_codegen::isa::TargetFrontendConfig;
 use faerie::{Artifact, Decl};
-use failure::Error;
 #[cfg(not(feature = "std"))]
 use hashbrown::{hash_map, HashMap, HashSet};
 use more_asserts::assert_gt;

crates/debug/src/transform/attr.rs

@@ -5,7 +5,7 @@ use super::unit::PendingDieRef;
 use super::{DebugInputContext, Reader, TransformError};
 use crate::HashMap;
 use alloc::vec::Vec;
-use failure::Error;
+use anyhow::Error;
 use gimli::{
     write, AttributeValue, DebugLineOffset, DebugStr, DebuggingInformationEntry, UnitOffset,
 };

crates/debug/src/transform/expression.rs

@@ -1,12 +1,12 @@
 use super::address_transform::AddressTransform;
 use crate::{HashMap, HashSet};
 use alloc::vec::Vec;
+use anyhow::Error;
 use cranelift_codegen::ir::{StackSlots, ValueLabel, ValueLoc};
 use cranelift_codegen::isa::RegUnit;
 use cranelift_codegen::ValueLabelsRanges;
 use cranelift_entity::EntityRef;
 use cranelift_wasm::{get_vmctx_value_label, DefinedFuncIndex};
-use failure::Error;
 use gimli::{self, write, Expression, Operation, Reader, ReaderOffset, Register, X86_64};
 use more_asserts::{assert_le, assert_lt};
 

crates/debug/src/transform/line_program.rs

@@ -3,9 +3,9 @@ use super::attr::clone_attr_string;
 use super::{Reader, TransformError};
 use alloc::collections::BTreeMap;
 use alloc::vec::Vec;
+use anyhow::Error;
 use core::iter::FromIterator;
 use cranelift_entity::EntityRef;
-use failure::Error;
 use gimli::{
     write, DebugLine, DebugLineOffset, DebugStr, DebuggingInformationEntry, LineEncoding, Unit,
 };

crates/debug/src/transform/mod.rs

@@ -1,7 +1,7 @@
 use crate::gc::build_dependencies;
 use crate::{DebugInfoData, HashSet};
+use anyhow::Error;
 use cranelift_codegen::isa::TargetFrontendConfig;
-use failure::Error;
 use gimli::{
     write, DebugAddr, DebugAddrBase, DebugLine, DebugStr, LocationLists, RangeLists,
     UnitSectionOffset,

crates/debug/src/transform/range_info_builder.rs

@@ -1,9 +1,9 @@
 use super::address_transform::AddressTransform;
 use super::{DebugInputContext, Reader};
 use alloc::vec::Vec;
+use anyhow::Error;
 use cranelift_entity::EntityRef;
 use cranelift_wasm::DefinedFuncIndex;
-use failure::Error;
 use gimli::{write, AttributeValue, DebuggingInformationEntry, RangeListsOffset};
 use more_asserts::assert_lt;
 

crates/debug/src/transform/simulate.rs

@@ -5,9 +5,9 @@ use crate::read_debuginfo::WasmFileInfo;
 use crate::{HashMap, HashSet};
 use alloc::string::String;
 use alloc::vec::Vec;
+use anyhow::Error;
 use cranelift_entity::EntityRef;
 use cranelift_wasm::get_vmctx_value_label;
-use failure::Error;
 use gimli::write;
 use gimli::{self, LineEncoding};
 use std::path::PathBuf;

crates/debug/src/transform/unit.rs

@@ -7,8 +7,8 @@ use super::utils::{add_internal_types, append_vmctx_info, get_function_frame_inf
 use super::{DebugInputContext, Reader, TransformError};
 use crate::{HashMap, HashSet};
 use alloc::{string::String, vec::Vec};
+use anyhow::Error;
 use cranelift_entity::EntityRef;
-use failure::Error;
 use gimli::write;
 use gimli::{AttributeValue, DebuggingInformationEntry, Unit, UnitOffset};
 use wasmtime_environ::{ModuleVmctxInfo, ValueLabelsRanges};

crates/debug/src/transform/utils.rs

@@ -1,8 +1,8 @@
 use super::address_transform::AddressTransform;
 use super::expression::{CompiledExpression, FunctionFrameInfo};
 use alloc::vec::Vec;
+use anyhow::Error;
 use cranelift_wasm::DefinedFuncIndex;
-use failure::Error;
 use gimli::write;
 use wasmtime_environ::{ModuleVmctxInfo, ValueLabelsRanges};
 

crates/debug/src/write_debuginfo.rs

@@ -1,5 +1,4 @@
 use alloc::{string::String, vec::Vec};
-use core::result;
 use faerie::artifact::{Decl, SectionKind};
 use faerie::*;
 use gimli::write::{Address, Dwarf, EndianVec, Result, Sections, Writer};
@@ -26,19 +25,19 @@ pub fn emit_dwarf(
     artifact: &mut Artifact,
     mut dwarf: Dwarf,
     symbol_resolver: &dyn SymbolResolver,
-) -> result::Result<(), failure::Error> {
+) -> anyhow::Result<()> {
     let endian = RunTimeEndian::Little;
 
     let mut sections = Sections::new(WriterRelocate::new(endian, symbol_resolver));
     dwarf.write(&mut sections)?;
-    sections.for_each_mut(|id, s| -> result::Result<(), failure::Error> {
+    sections.for_each_mut(|id, s| -> anyhow::Result<()> {
         artifact.declare_with(
             id.name(),
             Decl::section(SectionKind::Debug),
             s.writer.take(),
         )
     })?;
-    sections.for_each_mut(|id, s| -> result::Result<(), failure::Error> {
+    sections.for_each_mut(|id, s| -> anyhow::Result<()> {
         for reloc in &s.relocs {
             artifact.link_with(
                 faerie::Link {