Use miette for reporting errors

This gives us errors with annotated context like this:

```
Error:
  × type error: Unknown variable 'x'
    ╭─[isle_examples/let.isle:24:1]
 24 │   (Lower (B.B z))
 25 │   (A.Add x y))
    ·          ┬
    ·          ╰── Unknown variable 'x'
    ╰────
```

cranelift/isle/Cargo.lock

@@ -2,6 +2,30 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "addr2line"
+version = "0.16.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3e61f2b7f93d2c7d2b08263acaa4a363b3e276806c68af6134c44f523bf1aacd"
+dependencies = [
+ "gimli",
+]
+
+[[package]]
+name = "adler"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
+
+[[package]]
+name = "aho-corasick"
+version = "0.7.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e37cfd5e7657ada45f742d6e99ca5788580b5c529dc78faf11ece6dc702656f"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "ansi_term"
 version = "0.11.0"
@@ -22,12 +46,39 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "autocfg"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cdb031dd78e28731d87d56cc8ffef4a8f36ca26c38fe2de700543e627f8a464a"
+
+[[package]]
+name = "backtrace"
+version = "0.3.61"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e7a905d892734eea339e896738c14b9afce22b5318f64b951e70bf3844419b01"
+dependencies = [
+ "addr2line",
+ "cc",
+ "cfg-if",
+ "libc",
+ "miniz_oxide",
+ "object",
+ "rustc-demangle",
+]
+
 [[package]]
 name = "bitflags"
 version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
 
+[[package]]
+name = "cc"
+version = "1.0.70"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d26a6ce4b6a484fa3edb70f7efa6fc430fd2b87285fe8b84304fd0936faa0dc0"
+
 [[package]]
 name = "cfg-if"
 version = "1.0.0"
@@ -44,7 +95,7 @@ dependencies = [
  "atty",
  "bitflags",
  "strsim",
- "textwrap",
+ "textwrap 0.11.0",
  "unicode-width",
  "vec_map",
 ]
@@ -58,6 +109,12 @@ dependencies = [
  "log",
 ]
 
+[[package]]
+name = "gimli"
+version = "0.25.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f0a01e0497841a3b2db4f8afa483cce65f7e96a3498bd6c541734792aeac8fe7"
+
 [[package]]
 name = "hermit-abi"
 version = "0.1.19"
@@ -67,11 +124,18 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "is_ci"
+version = "1.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "616cde7c720bb2bb5824a224687d8f77bfd38922027f01d825cd7453be5099fb"
+
 [[package]]
 name = "isle"
 version = "0.1.0"
 dependencies = [
  "log",
+ "miette",
  "thiserror",
 ]
 
@@ -83,6 +147,7 @@ dependencies = [
  "env_logger",
  "isle",
  "log",
+ "miette",
 ]
 
 [[package]]
@@ -100,6 +165,73 @@ dependencies = [
  "cfg-if",
 ]
 
+[[package]]
+name = "memchr"
+version = "2.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "308cc39be01b73d0d18f82a0e7b2a3df85245f84af96fdddc5d202d27e47b86a"
+
+[[package]]
+name = "miette"
+version = "3.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "024831248cacc3305f5bb33d9daf9df54d6d95bf462c58f388845a17388c47fe"
+dependencies = [
+ "atty",
+ "backtrace",
+ "miette-derive",
+ "once_cell",
+ "owo-colors",
+ "supports-color",
+ "supports-hyperlinks",
+ "supports-unicode",
+ "term_size",
+ "textwrap 0.14.2",
+ "thiserror",
+]
+
+[[package]]
+name = "miette-derive"
+version = "3.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "074acd9c89172a516def5d82b8d90fb724fecba9dcae6fcdd88a75689601349f"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "miniz_oxide"
+version = "0.4.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a92518e98c078586bc6c934028adcca4c92a53d6a958196de835170a01d84e4b"
+dependencies = [
+ "adler",
+ "autocfg",
+]
+
+[[package]]
+name = "object"
+version = "0.26.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "39f37e50073ccad23b6d09bcb5b263f4e76d3bb6038e4a3c08e52162ffa8abc2"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "once_cell"
+version = "1.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "692fcb63b64b1758029e0a96ee63e049ce8c5948587f2f7208df04625e5f6b56"
+
+[[package]]
+name = "owo-colors"
+version = "2.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3a61765925aec40abdb23812a3a1a01fafc6ffb9da22768b2ce665a9e84e527c"
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.29"
@@ -118,12 +250,69 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "regex"
+version = "1.5.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d07a8629359eb56f1e2fb1652bb04212c072a87ba68546a04065d525673ac461"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.6.25"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f497285884f3fcff424ffc933e56d7cbca511def0c9831a7f9b5f6153e3cc89b"
+
+[[package]]
+name = "rustc-demangle"
+version = "0.1.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7ef03e0a2b150c7a90d01faf6254c9c48a41e95fb2a8c2ac1c6f0d2b9aefc342"
+
+[[package]]
+name = "smawk"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f67ad224767faa3c7d8b6d91985b78e70a1324408abcb1cfcc2be4c06bc06043"
+
 [[package]]
 name = "strsim"
 version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
 
+[[package]]
+name = "supports-color"
+version = "1.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "32f5b0f9e689dd52e27228469dd68b7416b60d75b7571ae9060a5f4c50048fee"
+dependencies = [
+ "atty",
+ "is_ci",
+]
+
+[[package]]
+name = "supports-hyperlinks"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "590b34f7c5f01ecc9d78dba4b3f445f31df750a67621cf31626f3b7441ce6406"
+dependencies = [
+ "atty",
+]
+
+[[package]]
+name = "supports-unicode"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a8b945e45b417b125a8ec51f1b7df2f8df7920367700d1f98aedd21e5735f8b2"
+dependencies = [
+ "atty",
+]
+
 [[package]]
 name = "syn"
 version = "1.0.77"
@@ -135,6 +324,16 @@ dependencies = [
  "unicode-xid",
 ]
 
+[[package]]
+name = "term_size"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e4129646ca0ed8f45d09b929036bafad5377103edd06e50bf574b353d2b08d9"
+dependencies = [
+ "libc",
+ "winapi",
+]
+
 [[package]]
 name = "textwrap"
 version = "0.11.0"
@@ -144,6 +343,17 @@ dependencies = [
  "unicode-width",
 ]
 
+[[package]]
+name = "textwrap"
+version = "0.14.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0066c8d12af8b5acd21e00547c3797fde4e8677254a7ee429176ccebbe93dd80"
+dependencies = [
+ "smawk",
+ "unicode-linebreak",
+ "unicode-width",
+]
+
 [[package]]
 name = "thiserror"
 version = "1.0.29"
@@ -164,6 +374,15 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "unicode-linebreak"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3a52dcaab0c48d931f7cc8ef826fa51690a08e1ea55117ef26f89864f532383f"
+dependencies = [
+ "regex",
+]
+
 [[package]]
 name = "unicode-width"
 version = "0.1.8"