Merge branch 'devel' into pr_when_typ

tests/compiler/tcmdline_import_std_prefix.nim

@@ -0,0 +1,10 @@
+discard """
+  matrix: "-d:nimPreviewSlimSystem --warning:StdPrefix:on --warningAsError:StdPrefix:on --import:std/objectdollar"
+  output: "(a: 23, b: 45)"
+"""
+
+type Foo = object
+  a, b: int
+
+let x = Foo(a: 23, b: 45)
+echo x

tests/errmsgs/tsso_string_index_var.nim

@@ -0,0 +1,13 @@
+discard """
+  cmd: "nim check --strings:sso --mm:orc --hints:off $file"
+  action: "reject"
+  nimout: '''
+tsso_string_index_var.nim(13, 12) Error: expression 's[0]' is immutable, not 'var'
+'''
+"""
+
+proc passByVar(c: var char) =
+  c = 'x'
+
+var s = "abc"
+passByVar(s[0])

tests/stdlib/tstrformat.nim

@@ -544,6 +544,12 @@ proc main() =
     var x = 5
     doAssert fmt"{(x=7;123.456)=:13e}" == "(x=7;123.456)= 1.234560e+02"
     doAssert x==7
+
+  block: # binary operators in interpolated expressions
+    let n = 1
+    doAssert &"{n-1}" == "0"
+    doAssert fmt"{n-1}" == "0"
+
   block: #curly bracket expressions and tuples
     proc formatValue(result: var string; value:Table|bool|JsonNode; specifier:string) = result.add $value