Fix "imported but not used" warnings (#20575)

compiler/cgmeth.nim

@@ -11,7 +11,7 @@
 
 import
   intsets, options, ast, msgs, idents, renderer, types, magicsys,
-  sempass2, strutils, modulegraphs, lineinfos
+  sempass2, modulegraphs, lineinfos
 
 when defined(nimPreviewSlimSystem):
   import std/assertions

compiler/docgen.nim

@@ -20,7 +20,6 @@ import
 import packages/docutils/rstast except FileIndex, TLineInfo
 
 from uri import encodeUrl
-from std/private/globs import nativeToUnixPath
 from nodejs import findNodeJs
 
 when defined(nimPreviewSlimSystem):

compiler/modulegraphs.nim

@@ -11,7 +11,7 @@
 ## represents a complete Nim project. Single modules can either be kept in RAM
 ## or stored in a rod-file.
 
-import intsets, tables, hashes, md5_old, sequtils
+import intsets, tables, hashes, md5_old
 import ast, astalgo, options, lineinfos,idents, btrees, ropes, msgs, pathutils, packages
 import ic / [packed_ast, ic]
 

compiler/modules.nim

@@ -10,7 +10,7 @@
 ## Implements the module handling, including the caching of modules.
 
 import
-  ast, astalgo, magicsys, msgs, options,
+  ast, magicsys, msgs, options,
   idents, lexer, passes, syntaxes, llstream, modulegraphs,
   lineinfos, pathutils, tables, packages
 

compiler/passes.nim

@@ -14,7 +14,10 @@ import
   options, ast, llstream, msgs,
   idents,
   syntaxes, modulegraphs, reorder,
-  lineinfos, pathutils, std/sha1, packages
+  lineinfos, pathutils, packages
+
+when defined(nimsuggest):
+  import std/sha1
 
 when defined(nimPreviewSlimSystem):
   import std/syncio

compiler/ropes.nim

@@ -9,8 +9,6 @@
 
 # Ropes for the C code generator. Ropes are mapped to `string` directly nowadays.
 
-import hashes
-
 from pathutils import AbsoluteFile
 
 when defined(nimPreviewSlimSystem):