Rust: make ast-generator use mustache templates

This simplifies the code and decouples the code template from the data
that is fed into it.

Cargo.lock

@@ -92,9 +92,9 @@ dependencies = [
 
 [[package]]
 name = "anyhow"
-version = "1.0.94"
+version = "1.0.95"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c1fd03a028ef38ba2276dce7e33fcd6369c158a1bca17946c4b1b701891c1ff7"
+checksum = "34ac096ce696dc2fcabef30516bb13c0a68a11d30131d3df6f04711467681b04"
 
 [[package]]
 name = "argfile"
@@ -116,11 +116,14 @@ checksum = "7c02d123df017efcdfbd739ef81735b36c5ba83ec3c59c80a9d7ecc718f92e50"
 name = "ast-generator"
 version = "0.1.0"
 dependencies = [
+ "anyhow",
  "either",
  "itertools 0.12.1",
+ "mustache",
  "proc-macro2",
  "quote",
  "ra_ap_stdx",
+ "serde",
  "ungrammar",
 ]
 
@@ -412,7 +415,7 @@ dependencies = [
  "figment",
  "glob",
  "itertools 0.13.0",
- "log",
+ "log 0.4.22",
  "num-traits",
  "ra_ap_base_db",
  "ra_ap_cfg",
@@ -585,7 +588,7 @@ version = "0.14.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3d248bdd43ce613d87415282f69b9bb99d947d290b10962dd6c56233312c2ad5"
 dependencies = [
- "log",
+ "log 0.4.22",
 ]
 
 [[package]]
@@ -755,7 +758,7 @@ checksum = "15f1ce686646e7f1e19bf7d5533fe443a45dbfb990e00629110797578b42fb19"
 dependencies = [
  "aho-corasick",
  "bstr",
- "log",
+ "log 0.4.22",
  "regex-automata 0.4.9",
  "regex-syntax 0.8.5",
 ]
@@ -1020,6 +1023,15 @@ dependencies = [
  "scopeguard",
 ]
 
+[[package]]
+name = "log"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e19e8d5c34a3e0e2223db8e060f9e8264aeeb5c5fc64a4ee9965c062211c024b"
+dependencies = [
+ "log 0.4.22",
+]
+
 [[package]]
 name = "log"
 version = "0.4.22"
@@ -1072,7 +1084,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a4a650543ca06a924e8b371db273b2756685faae30f8487da1b56505a8f78b0c"
 dependencies = [
  "libc",
- "log",
+ "log 0.4.22",
  "wasi",
  "windows-sys 0.48.0",
 ]
@@ -1086,6 +1098,16 @@ dependencies = [
  "windows-sys 0.48.0",
 ]
 
+[[package]]
+name = "mustache"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "51956ef1c5d20a1384524d91e616fb44dfc7d8f249bf696d49c97dd3289ecab5"
+dependencies = [
+ "log 0.3.9",
+ "serde",
+]
+
 [[package]]
 name = "nohash-hasher"
 version = "0.2.0"
@@ -1105,7 +1127,7 @@ dependencies = [
  "inotify",
  "kqueue",
  "libc",
- "log",
+ "log 0.4.22",
  "mio",
  "walkdir",
  "windows-sys 0.48.0",
@@ -2068,9 +2090,9 @@ dependencies = [
 
 [[package]]
 name = "serde_with"
-version = "3.11.0"
+version = "3.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8e28bdad6db2b8340e449f7108f020b3b092e8583a9e3fb82713e1d4e71fe817"
+checksum = "d6b6f7f2fcb69f747921f79f3926bd1e203fce4fef62c268dd3abfb6d86029aa"
 dependencies = [
  "base64",
  "chrono",
@@ -2086,9 +2108,9 @@ dependencies = [
 
 [[package]]
 name = "serde_with_macros"
-version = "3.11.0"
+version = "3.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9d846214a9854ef724f3da161b426242d8de7c1fc7de2f89bb1efcb154dca79d"
+checksum = "8d00caa5193a3c8362ac2b73be6b9e768aa5a4b2f721d8f4b339600c3cb51f8e"
 dependencies = [
  "darling",
  "proc-macro2",
@@ -2160,7 +2182,7 @@ checksum = "61c910772f992ab17d32d6760e167d2353f4130ed50e796752689556af07dc6b"
 dependencies = [
  "chrono",
  "is-terminal",
- "log",
+ "log 0.4.22",
  "termcolor",
  "thread_local",
 ]
@@ -2313,7 +2335,7 @@ version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ee855f1f400bd0e5c02d150ae5de3840039a3f54b025156404e34c23c03f47c3"
 dependencies = [
- "log",
+ "log 0.4.22",
  "once_cell",
  "tracing-core",
 ]
@@ -2502,7 +2524,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5f89bb38646b4f81674e8f5c3fb81b562be1fd936d84320f3264486418519c79"
 dependencies = [
  "bumpalo",
- "log",
+ "log 0.4.22",
  "proc-macro2",
  "quote",
  "syn",