error display underline now includes a.f(b) (b) part

mers_lib/src/parsing/statements.rs

@@ -51,11 +51,10 @@ pub fn parse(src: &mut Source) -> Result<Option<Box<dyn program::parsed::MersSta
                 let chained = parse_no_chain(src)?.expect("err: EOF instead of chain");
                 // allow a.f(b, c) syntax (but not f(a, b, c))
                 if let Some('(') = src.peek_char() {
-                    let pos_in_src = src.get_pos();
                     src.next_char();
                     let elems = parse_multiple(src, ")")?;
                     first = Box::new(program::parsed::tuple::Tuple {
-                        pos_in_src: (pos_in_src, src.get_pos()).into(),
+                        pos_in_src: (first.source_range().start(), src.get_pos()).into(),
                         elems: [first].into_iter().chain(elems).collect(),
                     });
                 }

mers_lib/src/program/parsed/assign_to.rs

@@ -25,4 +25,7 @@ impl MersStatement for AssignTo {
             source: self.source.compile(info, comp)?,
         }))
     }
+    fn source_range(&self) -> SourceRange {
+        self.pos_in_src
+    }
 }

mers_lib/src/program/parsed/block.rs

@@ -28,4 +28,7 @@ impl MersStatement for Block {
                 .collect::<Result<Vec<_>, _>>()?,
         }))
     }
+    fn source_range(&self) -> SourceRange {
+        self.pos_in_src
+    }
 }

mers_lib/src/program/parsed/chain.rs

@@ -24,4 +24,7 @@ impl MersStatement for Chain {
             chained: self.chained.compile(info, comp)?,
         }))
     }
+    fn source_range(&self) -> SourceRange {
+        self.pos_in_src
+    }
 }

mers_lib/src/program/parsed/function.rs

@@ -47,4 +47,7 @@ impl MersStatement for Function {
             },
         }))
     }
+    fn source_range(&self) -> SourceRange {
+        self.pos_in_src
+    }
 }

mers_lib/src/program/parsed/if.rs

@@ -30,4 +30,7 @@ impl MersStatement for If {
             },
         }))
     }
+    fn source_range(&self) -> SourceRange {
+        self.pos_in_src
+    }
 }

mers_lib/src/program/parsed/init_to.rs

@@ -30,4 +30,7 @@ impl MersStatement for InitTo {
             source,
         }))
     }
+    fn source_range(&self) -> SourceRange {
+        self.pos_in_src
+    }
 }

mers_lib/src/program/parsed/mod.rs

@@ -2,6 +2,8 @@ use std::{collections::HashMap, fmt::Debug};
 
 use crate::info;
 
+use super::run::SourceRange;
+
 #[cfg(feature = "parse")]
 pub mod assign_to;
 #[cfg(feature = "parse")]
@@ -42,6 +44,7 @@ pub trait MersStatement: Debug + Send + Sync {
         }
         o
     }
+    fn source_range(&self) -> SourceRange;
 }
 
 #[derive(Clone, Copy)]

mers_lib/src/program/parsed/tuple.rs

@@ -28,4 +28,7 @@ impl MersStatement for Tuple {
                 .collect::<Result<Vec<_>, _>>()?,
         }))
     }
+    fn source_range(&self) -> SourceRange {
+        self.pos_in_src
+    }
 }

mers_lib/src/program/parsed/value.rs

@@ -23,4 +23,7 @@ impl MersStatement for Value {
             val: self.data.clone(),
         }))
     }
+    fn source_range(&self) -> SourceRange {
+        self.pos_in_src
+    }
 }

mers_lib/src/program/parsed/variable.rs

@@ -41,4 +41,7 @@ impl MersStatement for Variable {
             },
         }))
     }
+    fn source_range(&self) -> SourceRange {
+        self.pos_in_src
+    }
 }

mers_lib/src/program/run/mod.rs

@@ -74,6 +74,14 @@ impl From<(SourcePos, SourcePos)> for SourceRange {
         }
     }
 }
+impl SourceRange {
+    pub fn start(&self) -> SourcePos {
+        self.start
+    }
+    pub fn end(&self) -> SourcePos {
+        self.end
+    }
+}
 #[derive(Clone, Debug)]
 pub struct CheckError(Vec<CheckErrorComponent>);
 #[derive(Clone, Debug)]